The chiral aldehyde 7 was prepared by diastereoselective alkylation, subsequent 1,2- addition of isopropenylmagnesium bromide gave rise to a mixture (68:32) of the allylic alcohols 8 and 10 which was separated by recycling MPLC. Claisen rearrangement of the propionates of these alcohols under control of the enolate geometry finally yielded hydroxynonenoic acid 12b.
通过非对映选择性烷基化制备手性醛7,随后1,2-添加
异丙烯基溴化镁得到烯丙基醇8和10的混合物(68:32),通过再循环MPLC将其分离。这些醇的
丙酸酯的克莱森重排在烯醇盐几何形状的控制下最终产生羟基
壬烯酸12b。