Iridium-catalyzed diborylation of benzylic C–H bonds directed by a hydrosilyl group: synthesis of 1,1-benzyldiboronate esters
作者:Seung Hwan Cho、John F. Hartwig
DOI:10.1039/c3sc52824c
日期:——
We describe a regioselective diborylation of primary benzylic CâH bonds catalyzed by [Ir(COD)OMe]2 and 4,4â²-di-tert-butyl-2,2â²-bipyridine (dtbpy). The hydrosilyl group acts as a traceless directing group, providing access to a range of 1,1-benzyldiboronate esters in good yields. Transformations of the 1,1-benzyldiboronate ester products include chemoselective SuzukiâMiyaura cross-couplings and synthesis of tetrasubstituted alkenyl boronate esters.
A convenient procedure has been developed for the preparation of Group14 compounds by integrated palladium‐catalyzed cross‐coupling of aromatic iodides with the corresponding Group14hydrides in the presence of a base. The reaction conditions can be applied to the cross‐coupling of tertiary, secondary, and primary Group14 compounds. In most cases, the desired arylated products were obtained in synthetically
Monohydrosilanes can be prepared selectively in high yields from the reaction of various aryl and alkyl iodides with ytterbium metal followed by the reaction with dihydrosilanes.
The photocatalyzed synthesis of silanols from tertiary silanes has been carried out using eosin Y under air. This is a metal-free method that uses a low catalyst loading, atmospheric oxygen as the oxidant, and visible-light conditions (blue light).
使用曙红 Y 在空气中进行了由叔硅烷光催化合成硅烷醇。这是一种无金属方法,使用低催化剂负载、大气中的氧气作为氧化剂和可见光条件(蓝光)。
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