(S)-2-{(4S,6R)-6-[2-(tert-Butyl-diphenyl-silanyloxy)-ethyl]-2,2-dimethyl-[1,3]dioxan-4-yl}-7-[2-(tert-butyl-diphenyl-silanyloxy)-eth-(E)-ylidene]-5-hydroxy-2-methyl-dec-9-en-3-one 、
原甲酸三甲酯 在
甲醇 、
4-甲基苯磺酸吡啶 作用下,
以84%的产率得到(2S,4S,6R)-6-[2-(tert-Butyl-diphenyl-silanyloxy)-ethyl]-2-{(S)-4-[2-(tert-butyl-diphenyl-silanyloxy)-eth-(E)-ylidene]-2-hydroxy-hept-6-enyl}-2-methoxy-3,3-dimethyl-tetrahydro-pyran-4-ol