ethyl (3R)-8-amino-9,10-difluoro-3-fluoromethyl-2,3-dihydro-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate → (3R)-8-amino-9,10-difluoro-3-fluoromethyl-2,3-dihydro-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid
反応式
[NH2:1][C:2]1[C:16]2[C:15](=[O:17])[C:14]([C:18]([O:20]CC)=[O:19])=[CH:13][N:7]3[C@@H:8]([CH2:11][F:12])[CH2:9][O:10][C:5]([C:6]=23)=[C:4]([F:23])[C:3]=1[F:24]>OS(O)(=O)=O.O.CC(O)=O>[NH2:1][C:2]1[C:16]2[C:15](=[O:17])[C:14]([C:18]([OH:20])=[O:19])=[CH:13][N:7]3[C@@H:8]([CH2:11][F:12])[CH2:9][O:10][C:5]([C:6]=23)=[C:4]([F:23])[C:3]=1[F:24]参加物
3
反応物 1
生成物 1
試薬・触媒・溶媒 1
実験手順
A suspension of ethyl (3R)-8-amino-9,10-difluoro-3-fluoromethyl-2,3-dihydro-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate (270 mg, 0.789 mmol) in a mixture of H2SO4—H2O—AcOH (1:5:6, 3 mL) was heated under reflux for 1 h. The reaction mixture was poured into ice-water and the resulting precipitates were collected by filtration. The filtered precipitates were washed with water, and dried in vacuo to give (3R)-8-amino-9,10-difluoro-3-fluoromethyl-2,3-dihydro-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid (237 mg, 96%) as a yellow powder.