Regiospecific Functionalization of Methyl C−H Bonds of Alkyl Groups in Reagents with Heteroatom Functionality
作者:Joshua D. Lawrence、Makoto Takahashi、Chulsung Bae、John F. Hartwig
DOI:10.1021/ja044933x
日期:2004.12.1
rhodium-catalyzed borylation of saturated terminal C-H bonds in molecules with existing functionality. Moderate to good yields were obtained with the organic substrate in excess and as limiting reagent. The borylations of trialkylamines, protected alcohols, protected ketones, and fluoroalkanes occurred regiospecifically at the methyl group that is least sterically hindered. Reactions were also conducted that probed
我们报告了具有现有功能的分子中饱和末端 CH 键的区域特异性、铑催化硼化。使用过量的有机底物并作为限制试剂获得中等至良好的产率。三烷基胺、受保护的醇、受保护的酮和氟代烷烃的硼酸化发生在空间位阻最小的甲基上。还进行了探测对烷基硼化的电子效应的反应。这些反应表明硼酸化优先发生在最缺电子的甲基上。还开发了进行 CH 键串联硼酸化和将所得硼酸酯转化为醇、烷基芳烃和烷基三氟硼酸酯的方法。