反应详情

A mixture of 4.5 parts of 3-(2-chloroethyl)-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one monohydrochloride, 4.6 parts of 4-[(4-fluorophenyl)phenylmethylene]piperidine hydrochloride, 2 parts of a sodium methoxide solution 30%, 8 parts of sodium carbonate, 0.2 parts of potassium iodide and 240 parts of 4-methyl-2-pentanone was stirred and refluxed for 22 hours. The reaction mixture was filtered hot and the filtrate was evaporated. The residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (92:8 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was converted into the hydrochloride salt in acetonitrile and 2-propanol. The salt was filtered off and dried, yielding 4.8 parts (60%) of 3-[2-[4-[(4-fluorophenyl)phenylmethylene]-1-piperidinyl]ethyl]-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one dihydrochloride; mp. 264.6° C. (compound 137).

1. temperaturerefluxed for 22 hours
2. filtrationThe reaction mixture was filtered hot
3. customthe filtrate was evaporated
4. customThe residue was purified by column-chromatography over silica gel using
5. additiona mixture of trichloromethane and methanol (92:8 by volume) as eluent
6. customThe pure fractions were collected
7. customthe eluent was evaporated
8. filtrationThe salt was filtered off
9. customdried