通过使用双功能试剂 Me 2 (CH 2 Cl)SiCF 3实现了前所未有的串联三氟甲基硅烷化/分子内 S N 2 取代序列,从而可以高效构建已知方法难以获得的有价值的三氟甲基化硅氧烷环己烷。开发不对称变体的初步尝试表明,使用辛可宁衍生的二聚 PTC 催化剂可以提供高达 92% 对映体过量的手性硅氧烷环己烷。
Direct C(sp3)-Hfunctionalization of alkylnitriles is a low toxic and facile route to nitrile-containing compounds. In this research, the Ag2CO3-mediated nitrile methylenation of enol acetates is developed to prepare γ-ketonitriles through the direct C(sp3)-Hoxidativefunctionalization of acetonitrile. A radical pathway is proposed, and acetonitrile serves both as solvent and CN-containing radical
烷基腈的直接C(sp3)-H官能化是向含腈化合物的低毒易制毒途径。在这项研究中,开发了通过乙腈的直接C(sp 3)-H氧化功能化,由Ag 2 CO 3介导的烯醇乙酸盐腈腈甲基化反应,以制备γ-酮腈。提出了一种自由基途径,乙腈既是溶剂又是含CN的自由基源。
Light-Driven <i>N</i>-Heterocyclic Carbene Catalysis Using Alkylborates
a state-of-the-art methodology enabling radical–radical coupling. The catalytic process involves forming an acyl azolium intermediate from the NHC catalyst and an acyl donor, followed by single electron reduction of this key intermediate, which is largely dependent on the photoredox catalyst. We designed a radical NHC catalysis in which the direct photoexcitation of a borate to form a high reducing
The first example of the Pd-catalyzed addition of organoboron reagents to dinitriles, as an efficient means of preparing 2,5-diarylpyrroles and 2,6-diarylpyridines, has been discussed here. Furthermore, the highly selective carbopalladation of dinitriles with organoboron reagents to give long-chain ketonitriles has been developed as well. Based on the broad scope of substrates, excellent functional
Iron(III)-Light-Induced Homolysis: A Dual Photocatalytic Approach for the Hydroacylation of Alkenes Using Acyl Radicals via Direct HAT from Aldehydes
作者:Anurag Chinchole、Marco A. Henriquez、Diego Cortes-Arriagada、Alan R. Cabrera、Oliver Reiser
DOI:10.1021/acscatal.2c03315
日期:2022.11.4
generate acyl radicals from readily available aldehydes via hydrogen atom transfer (HAT). Synergistic cooperation, being supported by DFT studies, between earth-abundant iron(III)chloride and 9,10-diphenylanthracene (DPA) to activate the aldehyde for a HAT step proved to be an efficient, economic, and green route for the hydroacylation of electron-deficientalkenes under UV-light irradiation with broad functional