salicylic-aldehyde-derived L,X-type directing group with an electron-deficient 2-pyridone ligand to enable the β-methylene C(sp3 )-H arylation of aliphatic alcohols, which has not been possible previously. Notably, this protocol is compatible with heterocycles embedded in both alcohol substrates and aryl coupling partners. A site- and stereo-specific annulation of dihydrocholesterol and the synthesis of a key
尽管有最新进展,但是反应性和位点选择性仍然是C(sp3)-H键官能化方法实际应用的重大障碍。在这里,我们描述了一个系统,该系统将
水杨醛衍生的L,X型导向基团与缺电子的2-
吡啶酮
配体结合在一起,以使脂肪族醇的β-亚甲基C(sp3)-H芳基化以前有可能。值得注意的是,该方案与嵌入在醇底物和芳基偶联伙伴中的杂环兼容。二氢
胆固醇的位点和立体特异性环合以及
恩格列酮的关键中间体的合成说明了该方法的实用性。