Asymmetric catalysts prepared from optically active bisphosphites bridged by achiral diols
申请人:——
公开号:US20040199023A1
公开(公告)日:2004-10-07
This invention relates to asymmetric hydroformylation (hf) processes in which a prochiral or chiral compound is contacted in the presence of an optically active metal-ligand complex catalyst to produce an optically active aldehyde or product derived from an optically active aldehyde. The invention encompasses novel ligands and catalysts for use in such processes.
equivalents containing a Weinrebamide as one of the functionalities have been synthesized from commercially available o-, m-, and p-toluic acid. These bifunctional buildingblocks enabled efficient C-C bond formation through Wittig reaction with simple and functionalized aldehydes on one hand and a clean nucleophilic addition of 3,4,5-trimethoxy phenylmagnesium bromide onto the Weinrebamide functionality on
Synthesis of Bis(heteroaryl) Ketones by Removal of Benzylic CHR and CO Groups
作者:Arun Maji、Sujoy Rana、Akanksha、Debabrata Maiti
DOI:10.1002/anie.201308785
日期:2014.2.24
A copper‐catalyzed method for synthesis of diaryl ketones (Ar‐CO‐Ar′) through removal of benzylic ‐CH2‐, ‐CO‐, and ‐CHR‐ groups from Ar‐CO‐CXR‐Ar′ has been discovered. A number of symmetrical and unsymmetrical heterocyclic ketones, which are usually difficult to synthesize, can be prepared in good to excellent yields. This method was applied to the synthesis of the nonsteroidal anti‐inflammatory drug
发现了一种铜催化的方法,该方法通过从Ar-CO-CXR-Ar'中去除苄基-CH 2 -,-CO-和-CHR-基团来合成二芳基酮(Ar-CO-Ar')。可以以高至优异的产率制备通常难以合成的许多对称和不对称的杂环酮。该方法适用于非甾体类抗炎药Suprofen的合成(三步收率47%)。基于初步的力学和动力学研究,提出了一种活性Cu / O 2物种来介导重排反应。
A General Synthesis of Diarylketones by Means of a Three-Component Cross-Coupling of Aryl and Heteroaryl Bromides, Carbon Monoxide, and Boronic acids
Pd(OAc)2/di-1-adamantyl-n-butylphosphine (cataCXium A) is highly active in the three-component Suzuki carbonylation and represents the most general catalyst system reported up to now. A broad range of aryl/heteroarylbromides and aryl boronic acids can be coupled to the corresponding diarylketones at low catalyst loadings.
Ligand-Free Pd-Catalyzed Carbonylative Cross-Coupling Reactions under Atmospheric Pressure of Carbon Monoxide: Synthesis of Aryl Ketones and Heteroaromatic Ketones
作者:Hongling Li、Min Yang、Yanxing Qi、Jijun Xue
DOI:10.1002/ejoc.201001685
日期:2011.5
The carbonylative Suzuki cross-coupling reactions of boronic acids with aryl iodides catalyzed by Pd 2 (dba) 3 as a ligand-free catalyst under atmospheric pressure of carbonmonoxide has been firstly developed. Under mild reaction conditions, a broad range of aryl/heteroaryl iodides and aryl/heteroaryl boronic acids were selectively coupled to afford the corresponding diaryl ketones in good to excellent