反应详情

温度

0 °C

2-amino-5-bromo-3-methoxybenzoic acid (20.0 g, 81.30 mmol) is suspended in 250 mL THF, cooled to 0° C. and combined with borane-THF complex (315 mL, 0.315 mol). The reaction mixture is stirred for 5 d at 20° C. and then combined with 10 mL EtOH, stirred for 15 min and then stirred into 250 mL water. The mixture is extracted 3× with DCM, the combined organic phases are dried and the solvent is eliminated in vacuo. The crude product is suspended in DCM and extracted 2× with 400 mL 1 N hydrochloric acid. The combined aqueous phases are adjusted to pH 5-6 with potassium carbonate, the precipitate formed is filtered off and (2-amino-5-bromo-3-methoxy-phenyl)-methanol (HPLC-MS: tRet.=1.41 min, MS(M+H)+=232/234; method FEC3) is obtained.

1. stirringstirred for 15 min
2. extractionThe mixture is extracted 3× with DCM
3. customthe combined organic phases are dried
4. extractionextracted 2× with 400 mL 1 N hydrochloric acid
5. customthe precipitate formed
6. filtrationis filtered off