ethyl thioxoacetate 、
[(2E,4Z)-4,5-Bis-(tert-butyl-dimethyl-silanyloxy)-penta-2,4-dienyloxymethyl]-benzene 以
甲苯 为溶剂,
反应 2.0h,
以50%的产率得到(2R,3R,6S)-3-Benzyloxymethyl-5,6-bis-(tert-butyl-dimethyl-silanyloxy)-3,6-dihydro-2H-thiopyran-2-carboxylic acid ethyl ester