反应详情

Potassium t-butoxide (1.06 g) is added to a solution of 2.24 g of (imidazo[5,1-b]thiazol-2-yl)methyltriphenylphosphonium chloride hydrochloride in a mixture of 5 ml of THF and 5 ml of dimethylsulfoxide under ice cooling. The mixture is stirred under ice cooling for 2 hr, a solution of 1.32 g of (3R,5S)-1-allyloxycarbonyl-3-methanesulfonyloxy-5-formylpyrrolidine in 5 ml of THF, and the mixture is stirred under ice cooling for 2 hr. Ethyl acetate is added to the reaction mixture, and the mixture is successively washed with dilute hydrochloric acid and saturated saline and dried over magnesium sulfate. The solvent is removed by evaporation. The residue is purified by column chromatography on silica gel to give 1.07 g of (3R,5S)-1-allyloxycarbonyl-3-methanesulfonyloxy-5-[2-(imidazo[5,1-b]thiazol-2-yl)vinyl]pyrrolidine (a mixture of geometrical isomers).

1. washthe mixture is successively washed with dilute hydrochloric acid and saturated saline
2. dry with materialdried over magnesium sulfate
3. customThe solvent is removed by evaporation
4. customThe residue is purified by column chromatography on silica gel