A concise enantioselective synthesis of the AB ring system of the manzamine alkaloids by ring-closing enyne metathesis
作者:J.Stephen Clark、Robert J Townsend、Alexander J Blake、Simon J Teat、Amanda Johns
DOI:10.1016/s0040-4039(01)00404-x
日期:2001.4
The AB ring system found in the manzamine A and related alkaloids has been prepared from (−)-quinine by a short enantioselective route. The key step in the sequence is a ruthenium-catalysed ring-closing enyne metathesis re action which delivers a bicyclic diene in good yield. The functionality required for further elaboration of the AB system has been installed by sequential regioselective hydroboration
在甘露糖胺A和相关生物碱中发现的AB环系统是通过短对映选择性路线由(-)-奎宁制备的。序列中的关键步骤是钌催化的闭环烯炔复分解反应,该反应可提供高收率的双环二烯。通过顺序区域选择性硼氢化和立体选择性催化氨基羟基化,已经安装了进一步完善AB系统所需的功能。