Regio- and Stereoselective Synthesis of Multi-Alkylated Allylic Boronates through Three-Component Coupling Reactions between Allenes, Alkyl Halides, and a Diboron Reagent
作者:Yu Ozawa、Kohei Endo、Hajime Ito
DOI:10.1021/jacs.1c06538
日期:2021.9.1
valuable precursors for the rapid and stereoselective construction of densely substituted carbon skeletons. Herein, we report the first synthetic approach for differentially 2,3,3-trialkyl-substituted allylic boronates that contain a stereodefined tetrasubstituted alkene structure. Copper(I)-catalyzed regio- and stereoselective three-component coupling reactions between gem-dialkylallenes, alkyl halides
多取代的烯丙基硼酸酯是用于快速和立体选择性地构建密集取代的碳骨架的有吸引力且有价值的前体。在这里,我们报告了第一种合成方法,用于含有立体定义的四取代烯烃结构的差异化 2,3,3-三烷基取代的烯丙基硼酸酯。铜 (I) 催化的gem之间的区域选择性和立体选择性三组分偶联反应-二烷基丙二烯、卤代烷和二硼试剂提供空间拥挤的烯丙基硼酸酯。醛的烯丙基硼化非对映选择性地提供相应的带有季碳的高烯丙醇。一项计算研究表明,选择性决定机制与硼基铜 (I) 物种与丙二烯底物的配位以及硼基铜化步骤相关。