反应详情

Diethylazodicarboxylate (5.2 g) is added dropwise to a solution of 4-bromo-phenethylalcohol (2.01 g), and triphenylphosphine (7.9 g) in diethyl ether (16 mL) at 0° C. The reaction mixture is stirred for 10 minutes and a solution of acetone cyanohydrin (2.6 g) in diethyl ether (10 mL) is added. The clear orange solution is stirred for 5 minutes at 0° C. and then at 25° C. for 12 hours. The reaction mixture is then filtered, and washed with diethyl ether. The filtrate is concentrated under reduced pressure and chromatographed over silica gel (10% ethyl acetate-hexanes is used as the eluant) to provide the desired product as a pale yellow oil (2.04 g).

1. stirringThe clear orange solution is stirred for 5 minutes at 0° C.
2. waitat 25° C. for 12 hours
3. filtrationThe reaction mixture is then filtered
4. washwashed with diethyl ether
5. concentrationThe filtrate is concentrated under reduced pressure
6. customchromatographed over silica gel (10% ethyl acetate-hexanes