Toward the Development of a General Chiral Auxiliary. Enantioselective Alkylation and a New Catalytic Asymmetric Addition of Silyloxyfurans: Application to a Total Synthesis of (−)-Rasfonin
作者:Robert K. Boeckman,、Joseph E. Pero、Debra J. Boehmler
DOI:10.1021/ja063532+
日期:2006.8.1
An enantioselective total synthesis of the apoptosis-inducing natural product, (-)-rasfonin, is described. Camphor lactam-mediated asymmetric alkylation reactions enabled the installation of three stereogenic centers with >95:5 diastereoselectivity. A modified Corey-Peterson olefination was employed in the construction of the (E,E)-diene system. A highly diastereoselective, asymmetric vinylogous Mukaiyama
描述了诱导细胞凋亡的天然产物 (-)-rasfonin 的对映选择性全合成。樟脑内酰胺介导的不对称烷基化反应能够安装三个具有 >95:5 非对映选择性的立体中心。在 (E,E)-二烯系统的构建中采用了改进的 Corey-Peterson 烯化。使用手性阳离子恶唑硼烷催化剂进行高度非对映选择性、不对称的乙烯基向山羟醛加成反应。天然产物的吡喃酮核心是通过 DBU 促进的呋喃醇重排为其相应的吡喃醇并伴随 [1,4]-甲硅烷基转移制备的。