Enantioselective Formal Synthesis of (−)-Englerin A via a Rh-Catalyzed [4 + 3] Cycloaddition Reaction
作者:Jing Xu、Eduardo J. E. Caro-Diaz、Emmanuel A. Theodorakis
DOI:10.1021/ol1015652
日期:2010.8.20
An enantioselective formal synthesis of (−)-englerin A (1) is reported. Key to the strategy is a Rh-catalyzed [4 + 3] cycloaddition reaction between furan 10 and diazo ester 11 that, following an intramolecular aldol condensation, produces the tricyclic scaffold of englerin. This strategy also provides a rapid, efficient, and stereoselective access to the biologically significant core motif of the
报道了(−)-englerin A ( 1 )的对映选择性形式合成。该策略的关键是呋喃10和重氮酯11之间的 Rh 催化的 [4 + 3] 环加成反应,在分子内羟醛缩合后,产生 englerin 的三环支架。该策略还提供了快速、有效和立体选择性地获取愈创木烷倍半萜的具有生物学意义的核心基序。