Oh my Gold! Gold atoms stabilise catalytically active palladiumnanoparticles when engaged in an alloy heterogenised on carbon. The increased durability makes the Pd–Au/C catalyst more recyclable than the gold‐free Pd/C catalyst for the Sonogashirareaction.
Gold-Catalyzed Synthesis of 3-Pyrrolidinones and Nitrones from N-Sulfonyl Hydroxylamines via Oxygen-Transfer Redox and 1,3-Sulfonyl Migration
作者:Hyun-Suk Yeom、Eunsu So、Seunghoon Shin
DOI:10.1002/chem.201002863
日期:2011.2.7
Golden touch: Gold‐catalyzed reaction of N‐sulfonyl hydroxylamines with terminal alkyne led to 3‐pyrrolidinones by means of an oygen‐transfer redox reaction. This protocol constitutes a direct method for forming α‐amino carbonyl compounds. In sharp contrast, those with internal alkynes underwent 1,3‐sulfonyl migration leading to 3‐sulfonyl cyclic nitrones.
Divergent Syntheses of Fused β-Naphthol and Indene Scaffolds by Rhodium-Catalyzed Direct and Decarbonylative Alkyne-Benzocyclobutenone Couplings
作者:Peng-hao Chen、Tao Xu、Guangbin Dong
DOI:10.1002/anie.201310100
日期:2014.2.3
A tunable rhodium‐catalyzed intramolecular alkyne insertion reaction proceeding through the CC cleavage of benzocyclobutenones is described. Selective formation of either the direct or decarbonylative insertion product can be controlled by using different catalytic systems. A variety of fused β‐naphthol and indene scaffolds were obtained in good yields with high functional group tolerance. This work
Synthesis of Polysubstituted Fused Pyrroles by Gold-Catalyzed Cycloisomerization/1,2-Sulfonyl Migration of Yndiamides
作者:Philip J. Smith、Yubo Jiang、Zixuan Tong、Helena D. Pickford、Kirsten E. Christensen、Jeremy Nugent、Edward A. Anderson
DOI:10.1021/acs.orglett.1c02360
日期:2021.8.20
be achieved using Au(I) catalysis that proceeds at ambient temperature, and a thermally promoted process. The utility of the products is demonstrated by a range of reactions to functionalize the fusedpyrrole core.
炔二酰胺(双 N 取代的炔烃)是氮杂环的宝贵前体。在这里,我们报告了炔基-炔二酰胺的环异构化/1,2-磺酰基迁移以形成四氢吡咯并吡咯,这是前所未有的与药物化学相关的杂环支架。这种耐受官能团的转化可以使用在环境温度下进行的 Au(I) 催化和热促进过程来实现。通过一系列反应来使稠合吡咯核功能化,证明了这些产品的实用性。
Cu-Catalyzed Tandem Aerobic Oxidative Cyclization for the Synthesis of 3,3′-Bipyrroles from the Homopropargylic Amines
作者:Zhenjie Qi、Yong Jiang、Bingxiang Yuan、Yanning Niu、Rulong Yan
DOI:10.1021/acs.orglett.8b02201
日期:2018.8.17
Cu-catalyzed method for the synthesis of 3,3′-bipyrroles from homopropargylic amines through tandem aerobic oxidative cyclization involving the formation of C–C bond has been developed. The features of this reaction are a small number of Cu catalysis and simple starting substrates. Moreover, this procedure exhibits good functional group tolerance and a series of 3,3′-bipyrroles derivatives are obtained