反应详情

To a solution of (S)-2-bromo-3-(phenylmethoxy)propanoic acid (7.63 g, 29.4 mmol) in acetone (30 ml) was added solid diphenyldiazomethane (5.81 g, 29.9 mmol) over the course of three minutes. The solution heated and nitrogen evolved vigorously. The purple solution was stirred for an additional 45 minutes, followed by the addition of acetic acid (1 ml) to quench any residual diphenyldiazomethane. The solution was extracted with saturated sodium bicarbonate (50 ml), washed with saturated sodium chloride (50 ml), dried over magnesium sulfate and evaporated at reduced pressure to give the crude product (11.24 g). Purification by chromatography on silica gel (95:5; hexane:ethyl acetate) afforded the title compound (6.38 g).

1. temperatureThe solution heated
2. customto quench any residual diphenyldiazomethane
3. extractionThe solution was extracted with saturated sodium bicarbonate (50 ml)
4. washwashed with saturated sodium chloride (50 ml)
5. dry with materialdried over magnesium sulfate
6. customevaporated at reduced pressure
7. customto give the crude product (11.24 g)
8. customPurification by chromatography on silica gel (95:5; hexane:ethyl acetate)