Asymmetric total syntheses of (+)-coronafacic acid and (+)-coronatine, phytotoxins isolated from Pseudomonas syringae pathovars
作者:Shinji Nara、Hiroaki Toshima、Akitami Ichihara
DOI:10.1016/s0040-4020(97)00614-5
日期:1997.7
Asymmetric total synthesis of (+)-coronafacic acid (2), was accomplished via intramolecular 1, 6-conjugate addition as the key step. The chiral ester (+)-7 was prepared via two approaches: starting from (R)-(+)-4-acetoxy-2-cyclopenten-1-one (12), and using catalytic asymmetric Michael reactions promoted by heterobimetallic BINOL complexes. Coupling between (+)-2 and the protected coronamic acid 8 and subsequent
通过分子内1、6-共轭物的添加作为关键步骤,完成了(+)-冠糖酸(2)的不对称全合成。手性酯(+) - 7制备通过两种方法:从(起始- [R ) - (+) - 4-乙酰氧基-2-环戊烯-1-酮(12),以及使用催化不对称迈克尔反应由异核BINOL络合物促进。(+)- 2与受保护的冠状酰胺酸8之间的偶联以及随后的氢解脱保护提供了(+)-冠冕碱(1)。这是(+)- 1的第一个不对称全合成。