Asymmetric Construction of Spirocyclopentenebenzofuranone Core Structures via Highly Selective Phosphine-Catalyzed [3 + 2] Cycloaddition Reactions
作者:Klaus Albertshofer、Bin Tan、Carlos F. Barbas
DOI:10.1021/ol401087a
日期:2013.6.21
asymmetric [3 + 2] cycloaddition reaction between 3-substituted methylenebenzofuranone derivatives and diverse Morita–Baylis–Hillman carbonates to provide complex polysubstituted spirocyclopentenebenzofuranone scaffolds in a single step is reported. C2-symmetric phospholanes were efficient nucleophilic catalysts of this transformation under mild conditions, providing reaction products comprised of three
据报道,3-取代的亚甲基苯并呋喃酮衍生物与多种森田-贝利斯-希尔曼碳酸盐之间的有效有机催化不对称[3 + 2]环加成反应可在一个步骤中提供复杂的多取代螺环戊烯-苯并呋喃酮骨架。C 2对称膦酸酯是在温和条件下该转化的有效亲核催化剂,它提供由三个连续的立体中心(包括一个全碳中心)组成的反应产物,具有出色的对映选择性。