Transition-metal-free, ambient-pressure carbonylative cross-coupling reactions of aryl halides with potassium aryltrifluoroborates
作者:Fengli Jin、Wei Han
DOI:10.1039/c5cc01968k
日期:——
We disclose an unprecedented transition-metal-free carbonylative cross coupling of arylhalides with potassium aryl trifluoroborates even at atmospheric pressure of carbon monoxide. This protocol is efficient, operationally simple, and shows...
Abstract Disclosed herein is a photochemical organocatalytic strategy for the direct enantioselective Mannich-type reaction of 2-alkylbenzophenones and cyclicimines. The chemistry exploits the light-triggered enolization of 2-alkylbenzophenones to generate transient hydroxy-o-quinodimethanes. These fleeting intermediates can be stereoselectively intercepted by imines upon activation with a chiral organic
aryl(o‐tolyl)methanones with arylsulfonyl hydrazides or arylsulfonyl chlorides has been developed. Arylsulfonyl hydrazides and arylsulfonyl chlorides were employed as sulfonylating reagents respectively to complete this transformation. During the reaction, enols were generated in situ from aryl(o‐tolyl)methanones under UV irradiation, and subsequently reacted with sulfonyl radicals to provide a range of aryl(2
A Chiral Nitrogen Ligand for Enantioselective, Iridium-Catalyzed Silylation of Aromatic C−H Bonds
作者:Bo Su、Tai-Gang Zhou、Xian-Wei Li、Xiao-Ru Shao、Pei-Lin Xu、Wen-Lian Wu、John F. Hartwig、Zhang-Jie Shi
DOI:10.1002/anie.201609939
日期:2017.1.19
containing dative nitrogen ligands are highly active for the borylation and silylation of C−Hbonds, but chiral analogs of these catalysts for enantioselective silylation reactions have not been developed. We report a new chiral pyridinyloxazoline ligand for enantioselective, intramolecular silylation of symmetrical diarylmethoxy diethylsilanes. Regioselective and enantioselective silylation of unsymmetrical
The RuPHOX-Ru catalyzedasymmetrichydrogenation of diaryl ketones has been established, providing the corresponding chiral diaryl methanols in up to 99% yield and 99% ee. The protocol could be performed on a gram-scale with a relatively low catalyst loading (2000 S/C) and the resulting products allow for several useful transformations, in particular for the synthesis of chiral drugs, such as, (S)-Orphenadrine
已经建立了 RuPHOX-Ru 催化的二芳基酮不对称氢化,以高达 99% 的产率和 99% ee 提供相应的手性二芳基甲醇。该方案可以在催化剂负载量相对较低 (2000 S/C) 的克规模上进行,所得产品可进行多种有用的转化,特别是用于手性药物的合成,例如 ( S ) -Orphenadrine和( S )-新苯二甲酸。氘标记和对照实验表明,RuPHOX-Ru 催化的不对称氢化完全以 H 2作为唯一氢源进行氢化。