Acetyl chloride → HCID 15096950, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 7.5 parts of cis-4-amino-5-chloro-N-[1-[3-(4-fluorophenoxy)propyl]-3-hydroxy-4-piperidinyl]-2-methoxybenzamide in 68 parts of tetrahydrofuran were added dropwise 2.02 parts of N,N-diethylethanamine. After cooling to 0° C., there was added dropwise a solution of 1.4 parts of acetyl chloride in 9 parts of tetrahydrofuran at a temperature below 0° C. Upon completion, stirring was continued for a while while cooling in an ice-bath. The reaction mixture was allowed to reach slowly room temperature and stirring was continued overnight at room temperature. The reaction mixture was evaporated and the residue was taken up in a sodium carbonate solution in water. The product was extracted with methylbenzene. The extract was washed with water, dried, filtered and evaporated The residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was further separated by HPLC using a mixture of trichloromethane, hexane and methanol (48:48:4 by volume) as eluent. The second fraction (B-isomer) was collected and the eluent was evaporated. The residue was suspended in petroleum ether. The product was filtered off and dried, yielding 1.7 parts of cis-4-[(4-amino-5-chloro-2-methoxybenzoyl)amino]-1-[3-(4-fluorophenoxy)propyl]-3-piperidinol acetate (ester); mp. 58.8° C. (compound 232).

Provenance & Evidence