dimethylallyllithium cuprate 、
生成 (S)-3-[(4S,5S,6R)-6-(2-Benzyloxy-ethyl)-2,2,5-trimethyl-[1,3]dioxan-4-yl]-5-methyl-hex-5-enoic acid ethyl ester 、 (S)-3-[(4S,5S,6R)-6-(2-Benzyloxy-ethyl)-2,2,5-trimethyl-[1,3]dioxan-4-yl]-5-methyl-hex-5-enoic acid ethyl ester