Benzene → cis-4-amino-5-chloro-N-[1-[2-[(4-fluorobenzoyl)amino]ethyl]-3-methoxy-4-piperidinyl]-2-methoxybenzamide

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A mixture of 11 parts of 1-(4-fluorobenzoyl)aziridine, 6.28 parts of cis-4-amino-5-chloro-2-methoxy-N-(3-methoxy-4-piperidinyl)benzamide, 45 parts of benzene and 20 parts of methanol was stirred and refluxed for 6 hours. The reaction mixture was evaporated and the residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (90:10 by volume as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from acetonitrile, yielding 5.09 parts of cis-4-amino-5-chloro-N-[1-[2-[(4-fluorobenzoyl)amino]ethyl]-3-methoxy-4-piperidinyl]-2-methyoxybenzamide; mp. 208.7° C. (compound 131).

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