3-Boronoacrolein as an Exceptional Heterodiene in the Highly Enantio- and Diastereoselective Cr(III)-Catalyzed Three-Component [4+2]/Allylboration
作者:Xuri Gao、Dennis G. Hall
DOI:10.1021/ja036368o
日期:2003.8.1
optimization of the first catalytic enantio- and diastereoselective hetero[4+2]/allylboration reaction to provide efficient access to alpha-hydroxyalkyl pyran derivatives. The key substrate 3-boronoacrolein pinacolate appears to be an exceptionally favorable heterodiene for use in Jacobsen's enantioselective reverse electron demand hetero[4+2] reaction with enol ethers, catalyzed by the tridentate (Schiff
该通讯报告了第一个催化对映选择性和非对映选择性杂[4+2]/烯丙基硼化反应的优化,以提供对α-羟烷基吡喃衍生物的有效获取。关键底物 3-硼丙烯醛频哪酸酯似乎是一种非常有利的杂二烯,可用于 Jacobsen 与烯醇醚的对映选择性反向电子需求杂 [4+2] 反应,由三齿(席夫碱)铬配合物 1 催化。这种一锅三-组分反应已成功应用于 (5R,6S)-6-乙酰氧基-5-十六烷内酯 (2) 的简明全合成,这是一种能够传播西尼罗河病毒的雌性库蚊的产卵引诱信息素。