The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with lmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)--3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with cyclopentyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with 2-methylmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-2-methyl-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with cyclopentyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The alkylation of 6-(2,6-difluorobenzyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (I) with cyclopentyl chloride (II) by means of K2CO3 gives 2-(cyclopentylsulfanyl)-6-(2,6-difluorobenzyl)pyridmidin-4(3H)-one (III), which is then methylated with Me-Cl and LDA in THF/HMPA to yield the target alpha-methylbenzyl pyrimidinone.

The methylation of 2-(2,6-difluorophenyl)acetic acid (I) with Me-Cl and LDA in THF/HMPA gives 2-(2,6-difluorophenyl)propionic acid (II), which is condensed with malonic acid monoethyl ester potassium salt (III) to yield 4?2,6-difluorophenyl)-3-oxopentanoic acid (IV). The cyclization of (IV) with thiourea (V) affords 6-[1-(2,6-difluorophenyl)ethyl]-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (VI), which is finally alkylated with cyclopentyl chloride (VII) to provide the target pyrimidinone derivative.

The alkylation of 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (I) with cyclopentyl chloride (II) by means of K2CO3 gives 2-(cyclopentylsulfanyl)-6-(2,6-difluorobenzyl)-5-methylpyridmidin-4(3H)-one (III), which is then methylated with Me-Cl and LDA in THF/HMPA to yield the target alpha-methylbenzyl pyrimidinone.

The methylation of 2-(2,6-difluorophenyl)acetic acid (I) with Me-Cl and LDA in THF/HMPA gives 2-(2,6-difluorophenyl)propionic acid (II), which is condensed with 2-methylmalonic acid monoethyl ester potassium salt (III) to yield 4?2,6-difluorophenyl)-2-methyl-3-oxopentanoic acid (IV). The cyclization of (IV) with thiourea (V) affords 6-[1-(2,6-difluorophenyl)ethyl]-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (VI), which is finally alkylated with cyclopentyl chloride (VII) to provide the target pyrimidinone derivative.

The reaction of 6-(2,6-difluorobenzyl)-2-(methylsulfanyl)pyrimidin-4(3H)-one (I) with thiomorpholine (II) gives the target thiomorpholino-pyrimidinone.

The reaction of 6-(2,6-difluorobenzyl)-2-(methylsulfanyl)pyrimidin-4(3H)-one (I) with dimethylamine (II) gives the target aminopyrimidinone.

The alkylation of 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (I) with methyl chloride by means of K2CO3 gives 6-(2,6-difluorobenzyl)-5-methyl-2-(methylsulfanyl)pyridmidin-4(3H)-one (II), which is then methylated with Me-Cl and LDA in THF/HMPA to yield the target alpha-methylbenzyl pyrimidinone.

The methylation of 2-(2,6-difluorophenyl)acetic acid (I) with Me-Cl and LDA in THF/HMPA gives 2-(2,6-difluorophenyl)propionic acid (II), which is condensed with 2-methylmalonic acid monoethyl ester potassium salt (III) to yield 4-(2,6-difluorophenyl)-2-methyl-3-oxopentanoic acid (IV). The cyclization of (IV) with thiourea (V) affords 6-[1-(2,6-difluorophenyl)ethyl]-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (VI), which is finally alkylated with methyl chloride to provide the target pyrimidinone derivative.

The reaction of 6-(2,6-difluorobenzyl)-5-methyl-2-(methylsulfanyl)pyrimidin-4(3H)-one (I) with isopropylamine (II) gives the target aminopyrimidinone.

The reaction of 6-(2,6-difluorobenzyl)-5-methyl-2-(methylsulfanyl)pyrimidin-4(3H)-one (I) with N-isopropyl-N-methylamine (II) gives the target aminopyrimidinone.

The cyclization of 4-(2,6-difluorophenyl)-2-methyl-3-oxopentanoic acid methyl ester (I) with N,N-dimethylguanidine (II) gives the target aminopyrimidinone.

When 4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with cyclopentyl chloride (IV) in alkaline medium afforded the required 2-(cyclopentylthio)-6-benzyl-3,4-dihydro-4-oxopyrimidine.

When 2-methyl-4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with sec-butyl chloride (IV) in alkaline medium afforded the required 2-(sec-butylthio)-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine

The reaction of 6-(2,6-difluorobenzyl)-5-methyl-2-(methylsulfanyl)pyrimidin-4(3H)-one (I) with dimethylamine (II) gives the target aminopyrimidinone.

Condensation of 2-methyl-4-phenyl-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 5-methyl-6-benzyl-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with isobutoxy sodium salt (IV) furnished 2-isobutoxy-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine.

Condensation of 4-phenyl-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 6-benzyl-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with isobutoxy sodium salt (IV) furnished 2-isobutoxy-6-benzyl-3,4-dihydro-4-oxopyrimidine

Condensation of 4-phenyl-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 6-benzyl-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with cyclohexoxy sodium salt (IV) furnished 2-cyclohexoxy-6-benzyl-3,4-dihydro-4-oxopyrimidine.

Condensation of 2-methyl-4-phenyl-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 5-methyl-6-benzyl-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with alkoxy or cyclohexoxy potassium salt furnished 2-cyclohexoxy-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine

Condensation of 4-(3-methylphenyl)-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 6-(3-methylbenzyl)-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with cyclohexoxy potassium salt furnished 2-cyclohexoxy-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine

Condensation of 2-methyl-4-(3-methylbenzyl)-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 5-methyl-6-(3-methylbenzyl)-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with cyclohexoxy potassium salt furnished 2-cyclohexoxy-5-methyl-6-(3-methylphenyl)-3,4-dihydro-4-oxopyrimidine

Condensation of 4-(3,5-dimethylphenyl)-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 6-(3,5-dimethylbenzyl)-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with cyclohexoxy potassium salt furnished 2-cyclohexoxy-6-(3,5-dimethylphenyl)-3,4-dihydro-4-oxopyrimidine

Condensation of 2-methyl-4-(3,5-dimethylphenyl)-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 5-methyl-6-(3,5-dimethylbenzyl)-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with cyclohexoxy potassium salt furnished 2-cyclohexoxy-5-methyl-6-(3,5-dimethylphenyl)-3,4-dihydro-4-oxopyrimidine

Condensation of 2-methyl-4-(3-methylbenzyl)-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 5-methyl-6-(3-methylbenzyl)-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with sec-butoxy potassium salt furnished 2-sec-butoxy-5-methyl-6-(3-methylphenyl)-3,4-dihydro-4-oxopyrimidine

Condensation of 4-(3-methylphenyl)-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 6-(3-methylbenzyl)-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with sec-butoxy potassium salt furnished 2-sec-butoxy-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine

Condensation of 2-methyl-4-(3,5-dimethylphenyl)-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 5-methyl-6-(3,5-dimethylbenzyl)-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with sec-butoxy potassium salt furnished 2-sec-butoxy-5-methyl-6-(3,5-dimethylphenyl)-3,4-dihydro-4-oxopyrimidine

Condensation of 4-(3,5-dimethylphenyl)-3-oxobutanoic acid methyl ester (I) with O-methyl isourea (II) led to the formation of 6-(3,5-dimethylbenzyl)-3,4-dihydro-2-methoxy-4-oxopyrimidine (III). Subsequent displacement of the methoxy group linked at C-2 of the pyrimidine ring by treatment with sec-butoxy potassium salt furnished 2-sec-butoxy-6-(3,5-dimethylphenyl)-3,4-dihydro-4-oxopyrimidine

When 4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with methyl chloride (IV) in alkaline medium afforded the required 2-(methylthio)-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with isopropyl chloride (IV) in alkaline medium afforded the required 2-(isopropylthio)-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with isobutyl chloride (IV) in alkaline medium afforded the required 2-(isobutylthio)-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with sec-butyl chloride (IV) in alkaline medium afforded the required 2-(sec-butylthio)-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with cyclohexyl chloride (IV) in alkaline medium afforded the required 2-(cyclohexylthio)-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 4-(3-methylphenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with methyl chloride (IV) in alkaline medium afforded the required 2-(methylthio)-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 4-(3-methylphenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with isopropyl chloride (IV) in alkaline medium afforded the required 2-(isopropylthio)-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 4-(3-methylphenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with isobutyl chloride (IV) in alkaline medium afforded the required 2-(isobutylthio)-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 4-(3-methylphenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with sec-butyl chloride (IV) in alkaline medium afforded the required 2-(sec-butylthio)-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 4-(3-methylphenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with ciclopentyl chloride (IV) in alkaline medium afforded the required 2-(ciclopentylthio)-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 4-(3-methylphenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with cyclohexyl chloride (IV) in alkaline medium afforded the required 2-(cyclohexylthio)-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 4-(3-methylphenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with allyl chloride (IV) in alkaline medium afforded the required 2-(allylthio)-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 4-(3-methylphenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with 1-chloro-but-2-ene (IV) in alkaline medium afforded the required 2-but-2-enylthio)-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 4-(3-methylphenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of the compound (III) with 1-chloro-3-methyl-but-2-ene (IV) in alkaline medium afforded the required 2-(3-methyl-but-2-enylthio)-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with methyl chloride (IV) in alkaline medium afforded the required 2-(methylthio)-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with isopropyl chloride (IV) in alkaline medium afforded the required 2-(isopropylthio)-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with isobutyl chloride (IV) in alkaline medium afforded the required 2-(isobutylthio)-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with sec-butyl chloride (IV) in alkaline medium afforded the required 2-(sec-butylthio)-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-phenyl-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-benzyl-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with ciclohexyl chloride (IV) in alkaline medium afforded the required 2-(cyclohexylthio)-5-methyl-6-benzyl-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-(3-methylphenyl)-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with methyl chloride (IV) in alkaline medium afforded the required 2-(sec-methylthio)-5-methyl-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-(3-methylphenyl)-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with isopropyl chloride (IV) in alkaline medium afforded the required 2-(isopropylthio)-5-methyl-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-(3-methylphenyl)-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with isobutyl chloride (IV) in alkaline medium afforded the required 2-(isobutylthio)-5-methyl-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-(3-methylphenyl)-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with sec-butyl chloride (IV) in alkaline medium afforded the required 2-(sec-butylthio)-5-methyl-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-(3-methylphenyl)-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with cyclopentyl chloride (IV) in alkaline medium afforded the required 2-(cyclopentylthio)-5-methyl-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

When 2-methyl-4-(3-methylphenyl)-3-oxobutanoic acid methyl ester (I) were reacted with thiourea (II), in the presence of sodium methoxide, condensation occurred with formation of 5-methyl-3,4-dihydro-6-(3-methylbenzyl)-4-oxo-2-thioxopyrimidine (III). Reaction of compound (III) with cyclohexyl chloride (IV) in alkaline medium afforded the required 2-(cyclohexylthio)-5-methyl-6-(3-methylbenzyl)-3,4-dihydro-4-oxopyrimidine

Condensation of 4-(1-naphthylmethyl)-3-oxobutanoic acid methyl ester (I) with thiourea (II) followed by alkylation of the thioxo group of compound (III) with sec-butyl iodide (IV) led to the formation of target compound

The condensation of 2-(1-naphthyl)acetonitrile (I) with 2-bromobutyric acid ethyl ester (II) by means of K2CO3 gives 2-ethyl-4-(!-naphthyl)-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) by means of NaOMe yielding 5-ethyl-6-(1-naphthylmethyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is condensed with methylsulfanylmethyl iodide (VI) to afford the title pyrimidinone derivative.

The condensation of 2-(1-naphthyl)acetonitrile (I) with 2-bromobutyric acid ethyl ester (II) by means of K2CO3 gives 2-ethyl-4-(!-naphthyl)-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) by means of NaOMe yielding 5-ethyl-6-(1-naphthylmethyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is condensed with ethylsulfanylmethyl iodide (VI) to afford the title pyrimidinone derivative.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with malonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with methyl chloride by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with malonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with isopropyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with malonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with butyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with malonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with isobutyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with lmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with 1-ethylpropyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with lmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)--3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with cyclohexyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with 2-methylmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-2-methyl-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with methyl chloride by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with 2-methylmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-2-methyl-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with isopropyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with 2-methylmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-2-methyl-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with butyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with 2-methylmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-2-methyl-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with isobutyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with 2-methyllmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)-2-methyl-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with 1-ethylpropyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with 2-methyllmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)--2-methyl-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with cyclohexyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The condensation of 2-(2,6-difluorophenyl)acetic acid (I) with 2-ethyllmalonic acid monoethyl ester sodium salt (II) gives 4-(2,6-difluorophenyl)--2-ethyl-3-oxobutyric acid ethyl ester (III), which is cyclized with thiourea (IV) to yield 6-(2,6-difluorobenzyl)-5-ethyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (V). Finally this compound is reacted with 1-ethylpropyl chloride (VI) by means of K2CO3 to afford the target pyrimidinone.

The alkylation of 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (I) with isopropyl chloride (II) by means of K2CO3 gives 6-(2,6-difluorobenzyl)-2-(isopropylsulfanyl)-5-methylpyridmidin-4(3H)-one (III), which is then methylated with Me-Cl and LDA in THF/HMPA to yield the target alpha-methylbenzyl pyrimidinone.

The methylation of 2-(2,6-difluorophenyl)acetic acid (I) with Me-Cl and LDA in THF/HMPA gives 2-(2,6-difluorophenyl)propionic acid (II), which is condensed with 2-methylmalonic acid monoethyl ester potassium salt (III) to yield 4-(2,6-difluorophenyl)-2-methyl-3-oxopentanoic acid (IV). The cyclization of (IV) with thiourea (V) affords 6-[1-(2,6-difluorophenyl)ethyl]-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (VI), which is finally alkylated with isopropyl chloride (VII) to provide the target pyrimidinone derivative.

The alkylation of 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (I) with butyl chloride (II) by means of K2CO3 gives 2-(butylsulfanyl)-6-(2,6-difluorobenzyl)-5-methylpyridmidin-4(3H)-one (III), which is then methylated with Me-Cl and LDA in THF/HMPA to yield the target alpha-methylbenzyl pyrimidinone.

The methylation of 2-(2,6-difluorophenyl)acetic acid (I) with Me-Cl and LDA in THF/HMPA gives 2-(2,6-difluorophenyl)propionic acid (II), which is condensed with 2-methylmalonic acid monoethyl ester potassium salt (III) to yield 4-(2,6-difluorophenyl)-2-methyl-3-oxopentanoic acid (IV). The cyclization of (IV) with thiourea (V) affords 6-[1-(2,6-difluorophenyl)ethyl]-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (VI), which is finally alkylated with butyl chloride (VII) to provide the target pyrimidinone derivative.

The alkylation of 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (I) with isobutyl chloride (II) by means of K2CO3 gives 6-(2,6-difluorobenzyl)-2-(isobutylsulfanyl)-5-methylpyridmidin-4(3H)-one (III), which is then methylated with Me-Cl and LDA in THF/HMPA to yield the target alpha-methylbenzyl pyrimidinone.

The methylation of 2-(2,6-difluorophenyl)acetic acid (I) with Me-Cl and LDA in THF/HMPA gives 2-(2,6-difluorophenyl)propionic acid (II), which is condensed with 2-methylmalonic acid monoethyl ester potassium salt (III) to yield 4-(2,6-difluorophenyl)-2-methyl-3-oxopentanoic acid (IV). The cyclization of (IV) with thiourea (V) affords 6-[1-(2,6-difluorophenyl)ethyl]-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (VI), which is finally alkylated with isobutyl chloride (VII) to provide the target pyrimidinone derivative.

The alkylation of 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (I) with 1-methylpropyl chloride (II) by means of K2CO3 gives 6-(2,6-difluorobenzyl)-5-methyl-2-(1-methylpropylsulfanyl)pyridmidin-4(3H)-one (III), which is then methylated with Me-Cl and LDA in THF/HMPA to yield the target alpha-methylbenzyl pyrimidinone.

The methylation of 2-(2,6-difluorophenyl)acetic acid (I) with Me-Cl and LDA in THF/HMPA gives 2-(2,6-difluorophenyl)propionic acid (II), which is condensed with 2-methylmalonic acid monoethyl ester potassium salt (III) to yield 4-(2,6-difluorophenyl)-2-methyl-3-oxopentanoic acid (IV). The cyclization of (IV) with thiourea (V) affords 6-[1-(2,6-difluorophenyl)ethyl]-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (VI), which is finally alkylated with 1-methylpropyl chloride (VII) to provide the target pyrimidinone derivative.

The alkylation of 6-(2,6-difluorobenzyl)-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (I) with cyclohexyl chloride (II) by means of K2CO3 gives 2-(cyclohexylsulfanyl)-6-(2,6-difluorobenzyl)-5-methylpyridmidin-4(3H)-one (III), which is then methylated with Me-Cl and LDA in THF/HMPA to yield the target alpha-methylbenzyl pyrimidinone.

The methylation of 2-(2,6-difluorophenyl)acetic acid (I) with Me-Cl and LDA in THF/HMPA gives 2-(2,6-difluorophenyl)propionic acid (II), which is condensed with 2-methylmalonic acid monoethyl ester potassium salt (III) to yield 4?2,6-difluorophenyl)-2-methyl-3-oxopentanoic acid (IV). The cyclization of (IV) with thiourea (V) affords 6-[1-(2,6-difluorophenyl)ethyl]-5-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidin-4-one (VI), which is finally alkylated with cyclohexyl chloride (VII) to provide the target pyrimidinone derivative.