反应详情

To a solution of 1.2 g of 4-amino-1-[3-(4-fluorophenoxy)propyl]-3-methoxypiperidine and 1.2 g of triethylamine in 50 ml of chloroform is added a solution of 2.5 g of 6-chloro-3,4-dihydro-4-methyl-3-oxo-2H-1,4-benzoxazine-8-carboxylic acid chloride in 10 ml of chloroform under cooling and stirring followed by stirring at room temperature for 4 hours. The resultant solution is washed with water, aqueous sodium hydrogen carbonate and then water, and dried over magnesium sulfate. After the solvent is distilled off under reduced pressure, the residue is purified by chromatography on silica gel using chloroform as an eluent, recrystallized from ethanol and treated with ethanolic hydrochloric acid to give 6-chloro-N-{1-[3-(4-fluorophenoxy)propyl]-3-methoxy-4-piperidyl}-3,4-dihydro-4-methyl-3-oxo-2H-1,4-benzoxazine-8-carboxamide hydrochloride hemihydrate, melting at 230° C. with decomposition.

1. temperatureunder cooling
2. stirringby stirring at room temperature for 4 hours
3. washThe resultant solution is washed with water, aqueous sodium hydrogen carbonate
4. dry with materialwater, and dried over magnesium sulfate
5. distillationAfter the solvent is distilled off under reduced pressure
6. customthe residue is purified by chromatography on silica gel
7. customrecrystallized from ethanol
8. additiontreated with ethanolic hydrochloric acid