see text] Chiral beta-syn-alkoxyhomoallylic alcohols derived from alkoxyallylboration of aldehydes upon oxidation provided the corresponding chiral ketones. Chelation-controlled nucleophilic addition to these ketones occurred in a highly stereoselective manner to afford anti-homoallylic tertiary alcohols. This methodology has been applied for the synthesis of the C(1)-C(11) subunit of C(8)-epi-fostriecin
[反应:见正文]醛在氧化后从醛的烷氧基烯丙基化得到的手性β-syn-烷氧基同烯丙基醇提供了相应的手性酮。这些酮的螯合控制的亲核加成反应以高度立体选择性的方式发生,从而提供了抗均烯丙基叔醇。此方法已应用于C(8)-表-
磷霉素的C(1)-C(11)亚基的合成。