Mannich reaction of N-(2-methoxyphenyl)piperazine (I) with 3-acetylbenzothiophene (II) in the presence of paraformaldehyde and HCl in refluxing EtOH leads to the piperazinyl propanone (III). Subsequent keto group reduction with NaBH4 gives the target alcohol.
Mannich reaction of N-(2-methoxyphenyl)piperazine (I) with 3-acetylthiophene (II) in the presence of paraformaldehyde and HCl in refluxing EtOH leads to the piperazinyl propanone (III). Subsequent keto group reduction with NaBH4 gives alcohol (IV). This is then condensed with 1-fluoronaphthalene (V) in the presence of NaH to produce the title naphthyl ether.