反应详情

Ethyl 2-chloroethanimidoate hydrochloride (ethyl chloroacetimidate hydrochloride) (2.58 g, 16.4 mmol) was added to a solution of tert-butyl 4-[(8-amino-5,6-dimethyltetraazolo[1,5-a]pyridin-7-yl)amino]butylcarbamate (3.80 g, 10.9 mmol) in chloroform (75 mL). The solution was stirred for 3 days, then saturated aqueous sodium bicarbonate (40 mL) was added. The aqueous phase was extracted with chloroform (3×40 mL). The organic phases were combined, washed with water (2×20 mL) and saturated aqueous sodium bicarbonate (20 mL), dried over magnesium sulfate, filtered, and concentrated under reduced pressure to afford 4.3 g of tert-butyl 4-[8-(chloromethyl)-5,6-dimethyl-7H-imidazo[4,5-c]tetraazolo[1,5-a]pyridin-7-yl]butylcarbamate, which was used in the next step without purification.

1. extractionThe aqueous phase was extracted with chloroform (3×40 mL)
2. washwashed with water (2×20 mL) and saturated aqueous sodium bicarbonate (20 mL)
3. dry with materialdried over magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure