(+)-<2R,4E,6(2R,4S,6S,8R,9S)>-6-(4-benzoyloxy-8,9-dimethyl-1,7-dioxaspiro<5.5>undecan-2-yl)-2,4-dimethyl-4-hexenal 、
(+)-(2R,5S(E),6S,8S,9S,11S)-11-<(tert-butyldiphenylsilyloxy)methyl>-9-methyl-2-phenyl-5-<2-(phenylsulphonyl)ethenyl>-1,3-dioxaspiro<5.5>undecan-8-ol 在
叔丁基锂 作用下,
以
四氢呋喃 为溶剂,
以83%的产率得到[(2R,4S,6R,8R,9S)-2-[(E,5R,8E)-7-(benzenesulfonyl)-8-[(2R,6S,8S,9S,11S)-11-[[tert-butyl(diphenyl)silyl]oxymethyl]-8-hydroxy-9-methyl-2-phenyl-1,3-dioxaspiro[5.5]undecan-5-ylidene]-6-hydroxy-3,5-dimethyloct-2-enyl]-8,9-dimethyl-1,7-dioxaspiro[5.5]undecan-4-yl] benzoate