(1R,4S,5S)-4-[(E)-(1S,2S)-6-(tert-Butyl-diphenyl-silanyloxy)-1-hydroxy-2-methoxy-4-methyl-hex-3-enyl]-7,7-dimethyl-2-oxa-bicyclo[3.2.0]heptan-3-one 、
4-甲氧基苯甲醛二甲缩醛 在
sodium tetrahydroborate 、 camphor-10-sulfonic acid 作用下,
以
甲醇 、
N,N-二甲基甲酰胺 为溶剂,
生成 (1R,4S)-4-[(4S,5S)-4-[(E)-(S)-5-(tert-Butyl-diphenyl-silanyloxy)-1-methoxy-3-methyl-pent-2-enyl]-2-(4-methoxy-phenyl)-[1,3]dioxan-5-yl]-2,2-dimethyl-cyclobutanol