反应详情

In a 200 ml autoclave were placed 4.6 g of 8,9-dichloro-5-methyl-6,7-dihydro-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid, 5 g of piperidine and 50 ml of hexamethylphosphoric triamide and the mixture was reacted at 160° C. on an oil bath for 5 hours. After completion of reaction hexamethylphosphoric triamide and piperidine were distilled off under reduced pressure and to the residue was added ethyl acetate and crystallized. Recrystallization from dimethylformamide-water give 1.3 g of 9-chloro-8-(1-piperidyl)-5-methyl-6,7-dihydro-1-oxo-1H,5H-benzo[ij]quinolizine-2-carboxylic acid. m.p. 246° to 248° C.

1. customthe mixture was reacted at 160° C. on an oil bath for 5 hours
2. distillationwere distilled off under reduced pressure and to the residue
3. additionwas added ethyl acetate
4. customcrystallized
5. customRecrystallization from dimethylformamide-water