反应详情

A solution of triphenylphosphine (21.1 g, 80.3 mmol) and carbon tetrabromide (13.32 g, 40.16 mmol) in dichloromethane (300 mL) at 0° C. was treated with a solution of 2-formyl -pyrrolidine-1-carboxylic acid tert-butyl ester (4.0 g, 20.08 mmol) in dichloromethane (10 mL) dropwise via syringe. The solution was stirred for 1 hour at room temperature, poured into a saturated sodium bicarbonate solution and separated. The organic phase was dried (MgSO4), filtered and concentrated. The concentrate was purified by flash chromatography on silica gel using 0-1% methanol/dichloromethane to give 6.13 g (86% yield) of the desired product. 1H NMR (300 MHz, CHLOROFORM-D) δ ppm 1.47 (s, 9H), 1.81 (m, 3H), 2.16 (m, 1H), 3.39 (m, 2H), 4.37 (s, 1H), 6.38 (s, 1H).

1. customseparated
2. dry with materialThe organic phase was dried (MgSO4)
3. filtrationfiltered
4. concentrationconcentrated
5. customThe concentrate was purified by flash chromatography on silica gel using 0-1% methanol/dichloromethane