Iridium-Catalyzed Regioselective Silylation of Secondary Alkyl C–H Bonds for the Synthesis of 1,3-Diols
作者:Bijie Li、Matthias Driess、John F. Hartwig
DOI:10.1021/ja5026479
日期:2014.5.7
Ir-catalyzed intramolecular silylation of secondary alkyl C-H bonds. (Hydrido)silyl ethers, generated in situ by dehydrogenative coupling of a tertiary or conformationally restricted secondary alcohol with diethylsilane, undergo regioselective silylation at a secondary C-H bond γ to the hydroxyl group. Oxidation of the resulting oxasilolanes in the same vessel generates 1,3-diols. This method provides a strategy
我们报告了仲烷基 CH 键的 Ir 催化的分子内硅烷化。通过叔醇或构象受限仲醇与二乙基硅烷的脱氢偶联原位生成的(氢化)甲硅烷基醚在与羟基的仲 CH 键 γ 处发生区域选择性甲硅烷基化。在同一容器中氧化所得氧杂环戊烷生成 1,3-二醇。该方法提供了一种通过仲烷基 CH 键的羟基导向功能化合成 1,3-二醇的策略。机理研究表明,CH 键断裂是催化循环的周转限制步骤。二级 CH 键的这种硅烷化仅比初级 CH 键的类似硅烷化慢 40-50 倍。