Asymmetric Hydrosilylation of β-Silyl Styrenes Catalyzed by a Chiral Palladium Complex
作者:Yi-Fan Wang、Yu-Han He、Yan Su、Yang Ji、Rui Li
DOI:10.1021/acs.joc.1c02734
日期:2022.3.4
catalyst for asymmetric hydrosilylation of β-silyl styrenes with trichlorosilane and 23 1,2-bis(silyl) chiral compounds were produced. Good to excellent enantioselectivities were observed with 1-aryl-2-silyl ethanols, where the trichlorosilyl groups of the hydrosilylation products were selectively converted into a hydroxyl group in the presence of pre-installed trialkylsilyl groups. Asymmetric hydrosilylation
与手性 SIPHOS 配体配位的钯配合物被评估为 β-甲硅烷基苯乙烯与三氯硅烷不对称氢化硅烷化的有效催化剂,并产生了 23 个 1,2-双(甲硅烷基)手性化合物。使用 1-芳基-2-甲硅烷基乙醇观察到良好至优异的对映选择性,其中氢化硅烷化产物的三氯甲硅烷基在预安装的三烷基甲硅烷基存在下选择性地转化为羟基。β-甲硅烷基苯乙烯的不对称氢化硅烷化,然后是三氯甲硅烷基的甲基化,得到稳定的 1,2-双(甲硅烷基)手性化合物4,产率很高。氢化钯B的 DFT 计算与氢化硅烷化反应的中间体 SIPHOS 配体配位,建立了能量最小的光学结构,结构信息可以很好地说明氢化硅烷化反应的对映选择性。