反应详情

温度

-10 °C

To a solution ethyl 9-iodo-4-oxo-4,5-dihydrobenzo[b]pyrazolo[1,5-d][1,4]oxazepine-2-carboxylate (3 g, 7.53 mmol, 1.00 equiv) in dichloromethane (50 mL) was added trimethylalumane (2.0M in toluene) (4.5 mL, 1.20 equiv) at −10° C. After being stirred for 2 hours at −10° C. the resulting solution was diluted with 20 mL of dichloromethane, washed with saturated ammonia chloride, extracted with dichloromethane, dried over anhydrous sodium sulfate, and concentrated under vacuum. The residue was purified by a silica gel column with ethyl acetate/petroleum ether (1:2) to give 2.4 g (77%) of the titled compound as a light yellow solid; LC-MS (ES, m/z): 415 [M+H]+.

1. washwashed with saturated ammonia chloride
2. extractionextracted with dichloromethane
3. dry with materialdried over anhydrous sodium sulfate
4. concentrationconcentrated under vacuum
5. customThe residue was purified by a silica gel column with ethyl acetate/petroleum ether (1:2)