作者:Lei Li、Qiao Yang、Yuan Wang、Yanxing Jia
DOI:10.1002/anie.201411338
日期:2015.5.18
conceptually new strategy featuring two metal‐catalyzed reactions as the key steps. A new method for the construction of 3,4‐fused benzofurans has been developed through a palladium‐catalyzed intramolecular Larock annulation reaction, which was successfully applied to the construction of the ABD tricyclic skeleton of 1 and 2. To achieve the asymmetric synthesis of 1 and 2, a ScIII/N,N′‐dioxide complex was used
(-)-加兰他敏(1)和(-)-lycoramine(2)的催化不对称全合成反应已通过采用概念上新颖的策略来实现,该策略以两个金属催化的反应为关键步骤。通过钯催化的分子内Larock环化反应,开发了一种3,4-稠合苯并呋喃的构建新方法,该方法已成功应用于1和2的ABD三环骨架的构建。为了实现1和2的不对称合成,Sc III / N,N'-二氧化物络合物被用来催化3-烷基取代的苯并呋喃酮向甲基乙烯基酮的对映选择性共轭加成反应,以构建手性季碳中心。