(R)-2-oxopropionic acid 4,4-dimethyl-2-oxo-tetrahydrofuran-3-yl ester 、 acetic acid 2-methyl-3-(dimethylphenylsilyl)-(E)-pent-1-enyl ester 在
四氯化锡 作用下,
以
二氯甲烷 为溶剂,
反应 24.0h,
以9.53 g的产率得到(2R,3S,4S,5S)-3-acetoxy-4-dimethylphenylsilyl-2,4-dimethyl-5-ethyl-tetrahydrofuran-2-carboxylic acid (S)-4,4-dimethyl-2-oxotetrahydrofuran-3-yl ester