2,2-二甲氧基丙烷 、
(1R,2S)-1-((2S,3R)-2,3-Dimethyl-4-triisopropylsilanyloxy-butyl)-2-[(S)-hydroxy-((2R,4S,5R)-5-hydroxy-2-phenyl-[1,3]dioxan-4-yl)-methyl]-4-methoxymethoxymethyl-cyclohex-3-enecarbonitrile 在
camphor-10-sulfonic acid 作用下,
以
二氯甲烷 为溶剂,
以88%的产率得到(1R,2S)-2-((4S,4aS,6R,8aR)-2,2-Dimethyl-6-phenyl-tetrahydro-[1,3]dioxino[5,4-d][1,3]dioxin-4-yl)-1-((2S,3R)-2,3-dimethyl-4-triisopropylsilanyloxy-butyl)-4-methoxymethoxymethyl-cyclohex-3-enecarbonitrile