Total Synthesis of (−)-Graminin A Based on Asymmetric Cyclization Carbonylation of Propargyl Acetate
作者:Yoichi Ito、Taichi Kusakabe、Yogesh Daulat Dhage、Keisuke Takahashi、Ken Sakata、Hiroaki Sasai、Keisuke Kato
DOI:10.1021/acs.joc.9b02886
日期:2019.12.20
The first total synthesis of (-)-graminin A is described. Key features of our synthetic approach involve a palladium-catalyzed asymmetric cyclization carbonylation of prochiral propargylic acetate, conversion of the orthoester product into methyl 4-oxo-3-furancarboxylate, and copper complex-mediated aldol condensation of (+)-gregatin B bearing a diene moiety. A new synthesis of (+)-gregatin B and the
描述了(-)-凝集素A的第一全合成。我们合成方法的主要特征包括前手性炔丙基乙酸钯的钯催化不对称环化羰基化,原酸酯产物转化为4-氧代-3-呋喃甲酸甲酯,以及铜络合物介导的带有(+)-聚集素B的羟醛缩合。二烯部分。实现了(+)-凝集素B的新合成和(-)-凝集素A的首次合成。