Ti(III)-mediated opening of 2,3-epoxy alcohols to build five-membered carbocycles with multiple chiral centres
作者:Midde Sreekanth、Gavinolla Pranitha、Bharatam Jagadeesh、Tushar Kanti Chakraborty
DOI:10.1016/j.tetlet.2011.02.001
日期:2011.4
is described. Sharpless kinetic resolution was applied as the key step to prepare the required 2,3-epoxy alcohols and a Ti(III) radical mediated opening of the epoxide ring followed by intramolecular trapping of the generated radical with a suitably placed α,β-unsaturated ester resulted in the formation of five-membered carbocycles with up to three consecutive new chiral centres stereoselectively fixed
描述了具有多个手性中心的高度取代的五元碳环的立体选择性构建。锐利的动力学拆分是制备所需2,3-环氧醇和Ti(III)自由基介导的环氧化物开环的关键步骤,然后用适当放置的α,β-不饱和酯分子内捕获所产生的自由基结果形成了五元碳环自行车,立体选择性地固定了多达三个连续的新手性中心。