Nickel-Catalyzed Ring-Opening of Benzofurans for the Divergent Synthesis of <i>ortho</i>-Functionalized Phenol Derivatives
作者:Changhui Lu、Yueping Lin、Minyan Wang、Jiaming Zhou、Shuo Wang、Huanfeng Jiang、Kai Kang、Liangbin Huang
DOI:10.1021/acscatal.2c04442
日期:2023.2.17
The ring-opening reaction of benzofuran is a highly desirable, yet underdeveloped transformation for the construction of valuable phenol derivatives. Herein, we report a nickel-catalyzed ring-opening transformation of benzofuran with silanes, giving ortho-alkene-, branched/linear alkyl silane-, and alkenyl silane-substituted phenol derivatives selectively. Control experiments and DFT calculations supported
苯并呋喃的开环反应是一种非常理想但尚未开发的转化,用于构建有价值的苯酚衍生物。在此,我们报道了镍催化的苯并呋喃与硅烷的开环转化,选择性地得到邻-烯烃-、支链/直链烷基硅烷-和烯基硅烷-取代的苯酚衍生物。对照实验和 DFT 计算支持 Ni-H 插入和 β-O 消除以实现苯并呋喃的正式 C-O 键活化,而不是通过将镍 (0) 直接氧化加成到苯并呋喃的 C-O 键中。通过 Ni(I)–H 或 Ni(I)–[Si] 中间体发生进一步的区域选择性氢化硅烷化或脱氢硅烷化,形成邻位-支链/直链烷基硅烷或烯基硅烷取代的苯酚衍生物。