Tether-Controlled Cycloadditions for the Asymmetric Synthesis of Decalins: Increased Selectivity in Acetonitrile Solvent
作者:Alex Melekhov、Pat Forgione、Stéphanie Legoupy、Alex G. Fallis
DOI:10.1021/ol0062042
日期:2000.9.1
influence of cis-isopropylidene acetal tether control groups, to facilitate the asymmetric synthesis of substituted decalins by intramolecular Diels-Alder reactions, is described. Compared to trans-acetonides, these cases proceed under milder conditions to afford the cis-fused adducts from an endo transition state. An unusual acetonitrile solvent effect exerts a dramatic influence on the diastereoselectivity
[反应:见正文]描述了顺式-异亚丙基缩醛链控制基团有利于通过分子内Diels-Alder反应不对称合成取代的十氢化萘的有益作用。与反式丙酮化物相比,这些情况在较温和的条件下进行,以从内过渡态得到顺式融合的加合物。异常的乙腈溶剂效应对非对映选择性产生了巨大影响。该策略导致了多种天然产物的手性非外消旋双环[4.4.0]癸烷核心。