反应详情

A mixture of 13.3 parts of ethyl 4-[[[4-(4,5-dihydro-2-oxazolyl)phenyl]amino]-methyl]-1-piperidinecarboxylate, 22.4 parts of potassium hydroxide and 240 parts of 2-propanol was stirred for 6 hours at reflux temperature. The reaction mixture was evaporated. The residue was taken up in water and the whole was evaporated again till all traces of 2-propanol were removed. The product was extracted with dichloromethane. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (97:3 by volume) as eluent. The pure fractions were collected and the eluent was evaporated, yielding 5.1 parts (49.1%) of N-[4-(4,5-dihydro-2-oxazolyl)phenyl]-4-piperidinemethanamine as a residue (int. 77).

1. temperatureat reflux temperature
2. customThe reaction mixture was evaporated
3. customthe whole was evaporated again till all traces of 2-propanol
4. customwere removed
5. extractionThe product was extracted with dichloromethane
6. customThe extract was dried
7. filtrationfiltered
8. customevaporated
9. customThe residue was purified by column chromatography over silica gel using
10. additiona mixture of trichloromethane and methanol (97:3 by volume) as eluent
11. customThe pure fractions were collected
12. customthe eluent was evaporated