Generation of Fused Seven-Membered Polycyclic Systems via Ring Expansion and Application to the Total Synthesis of Sesquiterpenoids
作者:Zhimin Xing、Bowen Fang、Shangwen Luo、Xingang Xie、Xiaolei Wang
DOI:10.1021/acs.orglett.2c01401
日期:2022.6.10
methods for synthesizing fused medium-sized bicyclo[m.n.0] ringsystems, including the benzo-cycloheptane systems, are still urgent. Herein we describe a base-induced ring expansion as a general strategy to construct a wide range of fused seven-membered ringsystems. The application of this method was demonstrated by the efficient total syntheses of two sesquiterpenoids, plecarpenene and plecarpenone
广泛存在于天然产物和分子药物中的七元多环结构是具有挑战性的合成靶标。然而,合成融合中型双环的方法[ m . n .0] 环系统,包括苯并环庚烷系统,仍然是紧迫的。在这里,我们将碱基诱导的环扩展描述为构建广泛的稠合七元环系统的一般策略。该方法的应用通过两种倍半萜类化合物 plecarpenene 和 plecarpenone 的高效全合成得到证明,两者均具有稠合的双环 [5.3.0] 癸烷骨架。
Asymmetric Formal Coupling of β-Ketoesters with Quinones Promoted by a Chiral Bifunctional N-Heterocyclic Olefin