A convenient synthesis of hydroxy esters 7 and lactones 8 by starting from easily available α,β-unsaturated carbocyclic acids 4 is described. The key step of this transformation is a hitherto unknown radical cyclization of silyl esters, which exhibits a high degree of regioselectivity through steric and orbital control.
描述了通过从容易获得的α,β-不饱和碳
环酸4开始方便地合成羟基酯7和内酯8的方法。该转变的关键步骤是迄今为止尚未发现的甲
硅烷基酯的自由基环化反应,该反应通过空间和轨道控制显示出很高的区域选择性。