Access to N-Substituted 2-Pyridones by Catalytic Intermolecular Dearomatization and 1,4-Acyl Transfer
作者:Guangyang Xu、Ping Chen、Pei Liu、Shengbiao Tang、Xinhao Zhang、Jiangtao Sun
DOI:10.1002/anie.201812937
日期:2019.2.11
A novel rhodium‐catalyzed dearomatization of O‐substituted pyridines to access N‐substituted 2‐pyridones has been developed. A computational study suggests a mechanism involving the formation of a pyridinium ylide followed by an unprecedented 1,4‐acyl migratory rearrangement from O to C. Furthermore, the chiral dirhodium complexes serve as the catalyst for the asymmetric transformation with excellent
Gold(I)-Catalyzed Diazo Coupling: Strategy towards Alkene Formation and Tandem Benzannulation
作者:Daming Zhang、Guangyang Xu、Dong Ding、Chenghao Zhu、Jian Li、Jiangtao Sun
DOI:10.1002/anie.201406712
日期:2014.10.6
A gold(I)‐catalyzed cross‐coupling of diazo compounds to afford tetrasubstituted alkenes has been developed by taking advantage of a trivial electronic difference between two diazo substrates. A N‐heterocyclic‐carbene‐derived gold complex is the most effective catalyst for this transformation. Based on this new strategy, a gold(I)‐initiated benzannulation has been achieved through a tandem reaction
Rhodium-Catalyzed 1,4-Aryl Rearrangement of Sulfur Ylide for the Synthesis of 2-Pyridyl Thioethers
作者:Jie Wang、Qing-Yang Li、Shan-Shan Wang、Xin-Yan Wu、Xingguang Li、Pei-Nian Liu
DOI:10.1021/acs.orglett.3c00068
日期:2023.2.3
We report a novel rhodium-catalyzed rearrangement involving N-substituted 2-thiopyridones and diazoesters. This reaction proceeds through the rhodium-catalyzed formation of sulfur ylides, followed by a direct C–N bond cleavage to achieve N-to-C 1,4-pyridyl migration. The protocol can be used to construct various thiopyridines possessing tetrasubstituted carbon stereocenters in moderate to excellent
我们报告了一种新型的铑催化重排,涉及 N-取代的 2-硫代吡啶酮和重氮酯。该反应通过铑催化形成硫叶立德,然后直接裂解 C-N 键实现 N-至 C 1,4-吡啶基迁移。该方案可用于构建各种具有四取代碳立构中心的硫代吡啶,收率中等至极佳,从而扩展了硫叶立德中间体在重排反应中的转化模式。