Diastereoselective Iodocarbocyclization Reaction of 2- or 3-Oxy-4-pentenylmalonate Derivatives
作者:Tadashi Inoue、Osamu Kitagawa、Yoko Oda、Takeo Taguchi
DOI:10.1021/jo961076+
日期:1996.11.15
induction in the iodocarbocyclization reaction of 4-pentenylmalonate derivatives having a stereogenic center at an allylic or a homoallylic position has been investigated. The iodocarbocyclization reactions of 3-oxy-4-pentenylmalonate derivatives proceeded with high cis-selectivity through stereoelectronic control of the oxygenated substituent at an allylic position. In the reaction of (S)-2-siloxy-4-pentenylmalonate
已经研究了在烯丙基或同烯丙基位置具有立体异构中心的4-戊烯基丙二酸酯衍生物在碘碳环化反应中的1,2-或1,3-不对称诱导。通过对烯丙基位置的氧化取代基进行立体电子控制,3-氧-4-戊烯基丙二酸酯衍生物的碘碳环化反应以高顺式选择性进行。在(S)-2-甲硅烷氧基-4-戊烯基丙二酸酯的反应中,通过利用手性钛催化剂的双重立体分化,获得了优异的非对映选择性。此外,作为本反应的应用,还描述了由光学纯的2-和3-氧-4-戊烯基丙二酸酯衍生物不对称合成环沙霉素和布雷菲德菌素A的合成中间体。