Ethyl Acetate → HCID 53824424, compound

Participants

Reaction Steps

To a solution of (2R,4R)-4-(t-butyldimethylsilyloxy)-2-{(1-methylimidazol-2-yl)methyl}pyrrolidineformate (20.0 g) in tetrahydrofuran (300 ml) and water (200 ml) was added dropwise a solution of allyl chloroformate (7.45 ml) in THF (20 ml), adjusting pH to 9.0~9.5 with 5N-aqueous sodium hydroxide solution, at -3°~1° C. over 10 minutes. The mixture was stirred at the same temperature for 50 minutes. To the reaction mixture was added ethyl acetate (600 ml) and ice water (400 ml). The organic layer was separated and the aqueous layer was extracted with ethyl acetate (100 ml). The combined organic layer was washed with water and brine, dried over magnesium sulfate and evaporated in vacuo to give (2R,4R)-1-allyloxycarbonyl-4-(t-butyldimethylsilyloxy)-2-{(1-methylimidazol-2-yl) methyl}pyrrolidine (20.5 g) as an oil.

Provenance & Evidence