反应详情

温度

45 °C

A mixture of 5.5 parts of {4-[2-{(4-chlorophenyl)[1-(1-methylethyl)-4-piperidinyl]amino}-2-oxoethyl]phenyl}ethyl carbonate and 50parts of a sodium hydroxide solution 10% is stirred for 90 minutes at 45° C. The reaction mixture is cooled to room temperature and acidified with acetic acid to pH 5.5-6. The product is extracted with trichloromethane. The extract is dried, filtered and evaporated. The oily residue is purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (80:20 by volume) as eluent. The pure fractions are collected and the eluent is evaporated. The oily residue is converted into the hydrochloride salt in 4-methyl-2-pentanone. The salt is filtered off and dried in vacuo for 12 hours at 60° C., yielding 1.9 parts of N-(4-chlorophenyl)-4-hydroxy-N-[1-(1-methylethyl)-4-piperidinyl]benzeneacetamide monohydrochloride; mp. 242.9° C.

1. temperatureThe reaction mixture is cooled to room temperature
2. extractionThe product is extracted with trichloromethane
3. customThe extract is dried
4. filtrationfiltered
5. customevaporated
6. customThe oily residue is purified by column-chromatography over silica gel using
7. additiona mixture of trichloromethane and methanol (80:20 by volume) as eluent
8. customThe pure fractions are collected
9. customthe eluent is evaporated
10. filtrationThe salt is filtered off
11. customdried in vacuo for 12 hours at 60° C.