Controlling the Molecular Topology of Vinylogous Iminium Ions by Logical Substrate Design: Highly Regio- and Stereoselective Aminocatalytic 1,6-Addition to Linear 2,4-Dienals
作者:Mattia Silvi、Indranil Chatterjee、Yiankai Liu、Paolo Melchiorre
DOI:10.1002/anie.201305870
日期:2013.10.4
about topology control: The title reaction yields valuable tetrahydrofuran spirooxindoles (see scheme; TMS=trimethylsilyl), and exemplifies a rare asymmetric 1,6‐addition to linear 2,4‐dienals proceeding with high δ‐site‐ and stereoselectivity. A steering group at the β‐dienal position ensured molecular preorganization of the catalytically active vinylogous iminium ion intermediate for highly predictable
有关拓扑控制的所有内容:标题反应可产生有价值的四氢呋喃螺硫醇(参见方案; TMS =三甲基甲硅烷基),并例举了罕见的不对称1,6加成反应,对线性2,4二烯进行高δ位和立体选择性的过程。β-二烯基位置上的一个转向基团确保了催化活性的乙烯基亚胺基离子中间体的分子预组织,从而可高度预测反应结果。