Ti-Catalyzed Radical Alkylation of Secondary and Tertiary Alkyl Chlorides Using Michael Acceptors
作者:Xiangyu Wu、Wei Hao、Ke-Yin Ye、Binyang Jiang、Gisselle Pombar、Zhidong Song、Song Lin
DOI:10.1021/jacs.8b08605
日期:2018.11.7
Alkyl chlorides are common functional groups in synthetic organic chemistry. However, the engagement of unactivated alkyl chlorides, especially tertiary alkyl chlorides, in transition-metal-catalyzed C-C bond formation remains challenging. Herein, we describe the development of a TiIII-catalyzed radical addition of 2° and 3° alkyl chlorides to electron-deficient alkenes. Mechanistic data are consistent
烷基氯是合成有机化学中常见的官能团。然而,未活化的烷基氯,特别是叔烷基氯在过渡金属催化的 CC 键形成中的参与仍然具有挑战性。在此,我们描述了 TiIII 催化的 2° 和 3° 烷基氯与缺电子烯烃的自由基加成的发展。机理数据与以 TiIII 介导的 Cl 原子抽象为特征的 C-Cl 键的内球激活一致。有证据表明,活性 TiIII 催化剂是在路易斯酸辅助电子转移过程中由 TiIV 前体产生的。