反应详情

To a stirred suspension of 2.99 parts of α-(hydroxymethyl)benzeneacetic acid in 60 parts of trichloromethane were added dropwise first 1.82 parts of N,N-diethylethanamine and then 1.95 parts of ethyl carbonochloridate at a temperature below 5° C. Upon completion, stirring was continued for 45 minutes at this low temperature. The thus obtained solution was added dropwise to a solution of 5.35 parts of cis-4-amino-N-[1-(2-aminoethyl)-3-methoxy-4-piperidinyl]-5-chloro-2-methoxybenzamide in 45 parts of trichloromethane while the temperature was kept below 10° C. Upon completion, the whole was stirred for 20 hours at room temperature. The organic layer was washed with a sodium carbonate solution in water and with water, dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol, saturated with ammonia, (98:2 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from acetonitrile and a few drops of water. The product was filtered off and dried in vacuo at 30° C., yielding 0.76 parts (10.0%) of cis-N-[2-[4-[(4-amino-5-chloro-2-methoxybenzoyl)amino]-3-methoxy-1-piperidinyl]ethyl]-α-(hydroxymethyl)benzeneacetamide; mp. 114.0° C. (compound 87).

1. customat a temperature below 5° C
2. customwas kept below 10° C
3. stirringUpon completion, the whole was stirred for 20 hours at room temperature
4. washThe organic layer was washed with a sodium carbonate solution in water and with water
5. customdried
6. filtrationfiltered
7. customevaporated
8. customThe residue was purified by column chromatography over silica gel using
9. additiona mixture of trichloromethane and methanol
10. customThe pure fractions were collected
11. customthe eluent was evaporated
12. customThe residue was crystallized from acetonitrile and a few drops of water
13. filtrationThe product was filtered off
14. customdried in vacuo at 30° C.