反应详情

温度

-78 °C

A solution of 3.24 g (0.02 mole) of 1-hydroxyethylbenzimidazole in 50 ml of methylene chloride was added to a solution of 2.44 ml (0.02 mole) of diethylaminosulfur trifluoride in 50 ml of methylene chloride cooled to -78° C. and under a nitrogen atmosphere. The reaction mixture was allowed to warm slowly to room temperature where it was stirred for 4 hours. The mixture was poured into water, the pH adjusted to 8 with aqueous sodium hydroxide solution and the organic layer separated and dried. Removal of the solvent gave 1.25 g of a brown oil which was chromatographed on 100 g of silica gel using 5% methanol chloroform as the eluent, 845 mg.

1. temperatureto warm slowly to room temperature where it
2. customthe organic layer separated
3. customdried
4. customRemoval of the solvent