Iodine-Catalyzed Synthesis of 1,2-Diaryldiketones by Oxidative Cleavage of 1,3-Diaryldiketones with DMSO
作者:Yu Yuan、Haitao Zhu
DOI:10.1002/ejoc.201101028
日期:2012.1
A metal-free, efficient, practical, and convenient process based on an iodine-catalyzedoxidativecleavage reaction has been developed to form 1,2-diaryldiketons in high yields from 1,3-diaryldiketones. The reaction is performed in DMSO and in air, and a mechanism was proposed according to the reaction evidence.
A Highly Stereoselective Metal-Free Hydrogenation of Diimines for the Synthesis of <i>Cis</i>-Vicinal Diamines
作者:Xiaxia Zhu、Haifeng Du
DOI:10.1021/acs.orglett.5b01380
日期:2015.6.19
A highlystereoselective metal-free hydrogenation of vicinal diimines has been successfully realized for the first time using 5–10 mol % of Piers’ borane as a catalyst under mild conditions, and a variety of cis-1,2-diamines were obtained in 92–99% yields. The current work provides a novel and efficient approach for the synthesis of vicinal diamines.
An efficient and practical method for the synthesis of unsymmetricbenzils from readily available β-ketoaldehydes has been developed. Various unsymmetric 1,2-diaryldiketones bearing functional groups have been obtained in good to excellent yields under mild reaction conditions. A plausible mechanism was proposed, and α,α-dichloroketone was considered as the key intermediate. The generation of α,α-dichloroketones
PdI2 in DMSO promoted the oxidation of functionalized diarylalkynes into benzil derivatives in excellent yields. This new oxidation reaction was achieved with short reaction times and low loading of palladium catalyst. This efficient catalytic process has been applied successfully to the one-pot construction of a series of nitrogen-containing heterocycles of biological interest according to a tandem oxidation-nitrogen nucleophiles condensation-cyclization. (c) 2008 Elsevier Ltd. All rights reserved.
Stereoselective Hydrosilylation of 1,2‐Diketones Catalyzed by Chiral Frustrated Lewis Pairs
作者:Ting Liu、Wei Meng、Xiangqing Feng、Haifeng Du
DOI:10.1002/anie.202313957
日期:2024.1.25
A highly stereoselective hydrosilylation of unsymmetrical vicinal diketones with PhSiH3 was accomplished under the frustrated Lewis pair (FLP) catalysis, delivering 1,2-di-aryl-1,2-anti-diols in high yields with >99/1 dr values and up to 97 % ee. The chiral FLP catalyst exhibits the ability to control regio-, diastereo-, and enantioselectivities, while silane PhSiH3 facilitates an intramolecular hydrosilylation