Construction of Bicyclic Ring Systems via a Transannular SmI<sub>2</sub>-Mediated Ketone−Olefin Cyclization Strategy
作者:Gary A. Molander、Barbara Czakó、Michael Rheam
DOI:10.1021/jo062292d
日期:2007.3.1
cyclooctene, cyclodecene, and cycloundecene derivatives revealed that the process proceeds with high yield and diastereoselectivity, and in the case of larger ring-sized compounds, with excellent regioselectivity. The regioselectivity of the annulation process could be rationalized based on examining the low energy conformations of the keto alkene starting materials. These results demonstrate the efficiency
形成多环结构的新方法和新策略的发展在有机合成中至关重要。本研究描述了构建双环体系的跨环环化策略的研究。为了测试该方法的可行性,SmI 2介导的酮-烯烃偶联反应(该实验室先前开发的方法)已得到检验。对环辛烯,环癸烯和环十一碳烯衍生物的跨环环化的研究表明,该过程以高收率和非对映选择性进行,而对于较大的环尺寸化合物,则具有出色的区域选择性。可以基于检查酮烯烃起始材料的低能构象来合理化环合过程的区域选择性。这些结果证明了环过环化策略用于创建双环系统的效率和潜力。