讨论了甲硅烷基二烯酸酯,Cu(II)盐和TBAT的反应产生相应的二烯丙基铜的反应。NMR和循环伏安分析相结合,首先突出了TBAT在Cu(II)还原为Cu(I)和预催化物质结构中的作用。从这些第一结果中,第二组NMR和理论研究使得能够确定二烯酸铜铜催化物质的结构和形成机理。最后,我们表明,铜催化剂通过二烯醇铜中间体促进了甲硅烷基二烯醇盐前体的E / Z s-顺式/ s-反式平衡。所有这些结果揭示了催化的和不对称的乙烯基Mukaiyama反应的某些特性。
Synthesis of the C1−C12 Fragment of Iriomoteolide 1a by Sequential Catalytic Asymmetric Vinylogous Aldol Reactions
作者:Lijing Fang、Haoran Xue、Jiong Yang
DOI:10.1021/ol801940r
日期:2008.10.16
An efficientsynthesis of the C1-C12 fragment of iriomoteolide 1a has been accomplished via sequential application of two catalytic, asymmetric, vinylogous aldol reactions: a catalytic vinylogous aldol reaction was used to enantioselectively introduce the C5-C8 segment, and a second catalytic vinylogous aldol reaction was used to install the remaining two stereocenters and a stereodefined alkene in