Synthesis of Silicon-Stereogenic Silanols Involving Iridium-Catalyzed Enantioselective C–H Silylation Leading to a New Ligand Scaffold
作者:Hongpeng Zhang、Dongbing Zhao
DOI:10.1021/acscatal.1c03112
日期:2021.9.3
organosilicon compounds, the enantioselective synthesis of silicon-stereogenic silanols through asymmetric catalysis remains a considerable challenge. Herein, we realized enantioselective construction of silicon-stereogenic diarylsilanols via an Ir-catalyzed C–H silylation of diarylsilanols along with stereospecific substitution or Tamao–Fleming oxidation. This strategy gives rise to a class of chiral diol catalyst
尽管人们越来越关注高度对映体富集的硅-立体异构有机硅化合物的构建,但通过不对称催化对硅-立体异构硅烷醇的对映选择性合成仍然是一个相当大的挑战。在此,我们通过 Ir 催化的二芳基硅烷醇的 C-H 甲硅烷基化以及立体有择取代或 Tamao-Fleming 氧化实现了硅-立体异构二芳基硅烷醇的对映选择性构建。这种策略产生了一类手性二醇催化剂核 (psiols)。psiol 的转化导致配体同时具有 Si 和 P 立体中心,这能够在铑 (I) 催化的芳基硼酸与环己烯酮的共轭 1,4-加成中产生出色的对映选择性。
Selective Electrochemical Hydrolysis of Hydrosilanes to Silanols via Anodically Generated Silyl Cations
The first electrochemical hydrolysis of hydrosilanes to silanols under mild and neutral reaction conditions is reported. The practical protocol employs commercially available and cheap NHPI as a hydrogen‐atom transfer (HAT) mediator and operates at room temperature with high selectivity, leading to various valuable silanols in moderate to good yields. Notably, this electrochemical method exhibits a