反应详情

温度

80 °C

A solution of 2.0 g of 2-chloromethyl-8-chloro-6-(2-pyridyl)-4H-imidazo [1,2-a][1,4]benzodiazepine in 50 ml of dioxan was treated with a solution of 0.62 g of sodium hydrogen carbonate in 18 ml of water and the mixture was stirred at 80° C. for 1.5 h. The mixture was evaporated in a vacuum. The residue was partitioned between dichloromethane and aqueous sodium hydrogen carbonate solution. The aqueous phase was extracted twice with dichloromethane. The dichloromethane extracts were dried over magnesium sulphate and chromatographed over 100 g of silica gel. 1.7 g of the desired product were eluted with dichloromethane/ethanol mixtures containing 8 to 12% ethanol. After recrystallization from ethyl acetate/diethyl (sic) ether there were obtained 1.65 g of 8-chloro-6-(2-pyridyl)-4H-imidazo[1,2-a][1,4]benzodiazepine-2-methanol of m.p. 206-207° C., which was converted into the hydrochloride (dec. above 300° C.).

1. customThe mixture was evaporated in a vacuum
2. customThe residue was partitioned between dichloromethane and aqueous sodium hydrogen carbonate solution
3. extractionThe aqueous phase was extracted twice with dichloromethane
4. dry with materialThe dichloromethane extracts were dried over magnesium sulphate
5. customchromatographed over 100 g of silica gel
6. wash1.7 g of the desired product were eluted with dichloromethane/ethanol mixtures
7. additioncontaining 8 to 12% ethanol
8. customAfter recrystallization from ethyl acetate/diethyl (sic) ether there