反应详情

温度

-78 °C

To a solution of 3,4-dihydro-1H-pyrrolo[2,1-c][1,4]oxazine-8-carboxylic acid ((R)-1-phenyl-propyl)-amide (9a) (2.50 g, 8.79 mmol) in dry dichloromethane (245 ml) at −78° C. was added N-bromo-succinimide (1.565 g, 8.79 mmol) in several portions (over 2 min) and the mixture was stirred for 110 min at −78° C., then aqueous 0.1 M sodium hydroxide was added, water was added, and the mixture was extracted 3 times with dichloromethane, the combined organic layers were dried over sodium sulfate, and evaporated to give 2.98 g (93%) of 6-bromo-3,4-dihydro-1H-pyrrolo[2,1-c][1,4]oxazine-8-carboxylic acid ((R)-1-phenyl-propyl)-amide. LC/MS (method 4): Rt=1.27 min; m/z=363.07 (M+H+).

1. extractionthe mixture was extracted 3 times with dichloromethane
2. dry with materialthe combined organic layers were dried over sodium sulfate
3. customevaporated