Direct Access to 1,1-Dicarbonyl Sulfoxonium Ylides from Aryl Halides or Triflates: Palladium-Catalyzed Carbonylation
作者:Yang Yuan、Xiao-Feng Wu
DOI:10.1021/acs.orglett.9b01926
日期:2019.7.5
The synthesis of 1,1-dicarbonyl sulfoxonium ylides by palladium-catalyzed carbonylation of aryl halides or triflates with α-carbonyl sulfoxonium ylides has been developed for the first time. This method provides a general approach to synthetically useful 1,1-dicarbonyl sulfoxonium ylides in high efficiency. The protocol displays a wide substrate scope, showing that the resulting 1,1-dicarbonyl sulfoxonium
An iridium-catalyzed B-H bond insertionreaction between borane adducts and sulfoxoniumylides to afford α-boryl carbonyls has been developed. The starting materials are safe and readily available. In addition, analogues of sulfoxoniumylides, such as sulfonium salts and sulfonium ylides could also be amenable to the reaction.
A ruthenium-catalyzed [5+1] annulation of 1-(2-aminophenyl)pyrroles with α-carbonyl sulfoxonium ylides is reported. This reaction provides a one-step method for synthesizing pyrrolo[1,2-a]quinoxaline derivatives under ambient conditions. The system proceeds with a short reaction time and a high functional-group tolerance. Notably, this divergent protocol tolerates β-keto sulfoxonium ylides and can
Metal-Free Insertion of Sulfoxonium Ylides into Arylamines in Water
作者:Mei Guan、Yong Wu、Hua He、Kaichuan Yan、Jianglian Li、Ruizhi Lai、Yi Luo
DOI:10.1055/s-0040-1707186
日期:——
bond formation in recent years. However, the existing methods suffer from unstable starting materials, expensive metal catalysts and organic solvents. Herein, insertion of sulfoxonium ylides into arylamines under metal-free conditions has been developed. The method employs water as solvent at mild temperature and is amenable to the late-stage modification of structurally complex bioactive compounds
chemodivergent reaction between stabilised sulfur ylides and salicylaldehydes, leading to the (suprising) formation of 2H-chromenes or dihydrobenzofurans products. Particular attention was set on the unusual mechanisms involved. Two unique reaction routes including two ylide units in the reactions are proposed. These pathways were validated by performing a selectivity switch in some cases, enabled