Dimethylformamide → N-[[1-[(2,3-dihydro-1,4-benzodioxin-2-yl)methyl]-4-piperidinyl]methyl]-N-methyl-2-benzothiazolamine

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To a stirred solution of 11.85 parts of N-[1-[(2,3-dihydro-1,4-benzodioxin-2-yl)methyl]-4-piperidinylmethyl]-2-benzothiazolamine in 72 parts of N,N-dimethylformamide were added portionwise 1.5 parts of a sodium hydride dispersion 50%. Upon completion, stirring was continued for 30 minutes. A solution of 4.6 parts of iodomethane in 18 parts of N,N-dimethylformamide was added dropwise. The whole was stirred overnight at room temperature. The reaction mixture was poured into water and the product was extracted twice with 4-methyl-2-pentanone. The combined organic layers were dried, filtered and evaporated. The residue was separated by column chromatography over silica gel using a mixture of trichloromethane and methanol (97:3 by volume) as eluent. The first fraction was collected and the eluent was evaporated. The residue was crystallized from a mixture of acetonitrile and 1,1'-oxybisethane, yielding 1 part of N[[1-[(2,3-dihydro-1,4-benzodioxin-2-yl)methyl]-4-piperidinyl]methyl]-N-methyl-2-benzothiazolamine; mp. 125.4° C. (compound 62).

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