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。
Practical and Selective Bio-Inspired Iron-Catalyzed Oxidation of Si–H Bonds to Diversely Functionalized Organosilanols
作者:Song Li、Haibei Li、Chen-Ho Tung、Lei Liu
DOI:10.1021/acscatal.2c02678
日期:2022.8.5
oxidant at an iron catalyst loading of 0.1 mol % is reported. The practical and highlyselective oxidation exhibits good functional group tolerance, allowing effective access to diverselyfunctionalized alkyl-, aryl-, alkynyl-, and alkoxysilanols, silanediols, as well as mono-, oligo-, and polymeric siloxanols with various substituent patterns. Late-stage gram-scale application in functional-molecule-containing