Short, Enantioselective Total Synthesis of Aflatoxin B<sub>2</sub> Using an Asymmetric [3+2]-Cycloaddition Step
作者:Gang Zhou、E. J. Corey
DOI:10.1021/ja054503m
日期:2005.8.1
A highly enantioselective [3+2]-cycloaddition reaction of 2,3-dihydrofuran with 1,4-benzoquinones using a chiral oxazaborolidinium triflimidate as catalyst has been developed which allows rapid access to a variety of chiral phenolic tricycles (enantiomeric excesses ranging from 91 to 98%). The utility of this new methodology is demonstrated by a short synthesis of the important pentacyclic natural
使用手性 oxazaborolidinium trifliimidate 作为催化剂,2,3-二氢呋喃与 1,4-苯醌的高度对映选择性 [3+2]-环加成反应已被开发,该反应可以快速获得各种手性酚类三环(对映体过量范围为 91到 98%)。重要的五环天然产物黄曲霉毒素 B2 的短合成证明了这种新方法的实用性。这项探索性研究表明,这些催化剂可能更广泛地应用于对映选择性环加成。