Modular Access to Quaternary α-Hydroxyl Acetates by Catalytic Cross-Coupling of Alcohols
作者:Guangkuo Zeng、Jiajie Wu、Lingyun Shen、Qingshu Zheng、Zhe-Ning Chen、Xin Xu、Tao Tu
DOI:10.1021/acscatal.2c05820
日期:2023.2.3
tris-N-heterocyclic carbene iridium (tris-NHC-Ir, 0.05 mol %) complexes as catalysts and Ba(OH)2 as the base, along with the generation of byproducts water and hydrogen gas. A plausible mechanism involving dehydrogenation of alcohols, aldol-condensation, and 1,2-alkyl rearrangement reactions was proposed, in which 1,2-alkyl rearrangement was responsible for the construction of the quaternary carbon center.
α-羟基酸及其衍生物因其独特而广泛的功能而备受关注。在此,我们成功地建立了一个选择性和模块化的方案,通过使用三-N-杂环卡宾铱(tris-NHC-Ir,0.05 mol %)通过 1,2-二醇和伯醇的脱氢交叉偶联获得季 α-羟基乙酸酯)络合物作为催化剂和Ba(OH) 2作为碱,同时产生副产物水和氢气。提出了一种涉及醇脱氢、羟醛缩合和 1,2-烷基重排反应的合理机制,其中 1,2-烷基重排负责季碳中心的构建。