[CH3:1][O:2][C:3](=[O:19])[NH:4][C:5]1[O:6][C:7]2[C:13]([N+:14]([O-])=O)=[CH:12][CH:11]=[C:10]([O:17][CH3:18])[C:8]=2[N:9]=1>CO.ClCCl.[Pd]>[CH3:1][O:2][C:3](=[O:19])[NH:4][C:5]1[O:6][C:7]2[C:13]([NH2:14])=[CH:12][CH:11]=[C:10]([O:17][CH3:18])[C:8]=2[N:9]=1To a stirred solution of 220 mg (0.82 mmol) (4-methoxy-7-nitro-benzooxazol-2-yl)-carbamic acid methyl ester in 25 ml methanol and 45 ml dichloromethane was added a spatula end of 10% palladium on charcoal and stirring continued for 18 h at room temperature under an atmosphere of hydrogen. The mixture was then filtered and the filtrate concentrated in vacuo. Flash chromatography (2/98 methanol/dichloromethane) afforded 114 mg (58%) (7-amino-4-methoxy-benzooxazol-2-yl)-carbamic acid methyl ester as a white crystalline solid. ES-MS m/e (%): 238 (M+H+, 100).
Wird geladen…
