The diazonium salt prepared from 2-amino-5-nitrophenol (I) was subjected to Sandmeyer reaction in the presence of HCl and CuCl to afford the chlorophenol derivative (II). Subsequent alkylation of phenol (II) with prenyl bromide (III) produced ether (IV). Amine (V) was then obtained by reduction of the nitro group of (IV) employing iron powder in the presence of HCl.

Chloroacetaldehyde (VII), prepared by acid hydrolysis of the dimethyl ketal (VI), was condensed with ethyl acetoacetate (VIII) to produce ethyl 2-methyl-3-furoate (IX). Basic hydrolysis of ester (IX), followed by chlorination of the resultant carboxylic acid (X) with SOCl2, gave acid chloride (XI). Then, condensation of amine (V) with acid chloride (XI) yielded amide (XII), which was finally converted to the title thioamide by treatment with Lawesson's reagent in hot toluene.