Total Synthesis of (+)-Isatisine A: Application of a Silicon-Directed Mukaiyama-Type [3 + 2]-Annulation
作者:Jihoon Lee、James S. Panek
DOI:10.1021/acs.joc.5b00051
日期:2015.3.20
synthesis highlights the use of a highly diastereoselective Mukaiyama-type [3 + 2]-annulation of allylsilane 5 with the unsaturated aldehyde 9a to assemble the functionalized tetrahydrofuran core of isatisine A. A convergent route to the framework of the natural product was established that employed a substrate-controlled indole coupling that was followed by a late-stage intramolecular copper(I)-mediated
描述了(+)-isatisine A(1)的不对称合成的完整细节。该合成突出显示了烯丙基硅烷5与不饱和醛9a的高度非对映选择性的Mukaiyama型[3 + 2]环化反应,用于组装异氰酸酯A的功能化四氢呋喃核。使用了受底物控制的吲哚偶联,然后进行后期分子内铜(I)介导的酰胺化反应,以完成(+)-艾地替宁A的四环骨架的组装。此外,[3 + 2使用非对映异构烯丙基硅烷抗-5和增强评估] -环化。syn - 5以建立有效的途径,以立体化学方式定义明确的四氢呋喃。