strategy for esterification of common amides using fluoride as a catalyst. This method shows high functional group tolerance, and notably it requires only a slight excess of the alcohol nucleophile, which is a rare case in transition‐metal‐free amide transformations. Moreover, this approach may provide a new understanding for further studies on esterification of amides and is expected to stimulate the development
A novel and efficient solvent-free and heterogeneous method for the synthesis of primary, secondary and bis-N-acylsulfonamides using metal hydrogen sulfate catalysts
Some metal hydrogen sulfates were used as acid catalysts in the N-acylation of different sulfonamides using carboxylic acid chlorides and anhydrides as acylating agents under both heterogeneous and solvent-free conditions. Al(HSO4)(3) and Zr(HSO4)(4) were found to have the highest activity and catalyze the reactions efficiently to furnish the primary N-acyl sulfonamides (RCONHSO2R'), secondary N-acylsulfonamides (RCONR '' SO2R') and bis-N-acylsulfonamnides [RCO(SO2R')N-R ''-N(SO2R')COR] in good to high yield. The mild reaction conditions, inexpensive and low toxicity of catalysts and easy work-up procedure make this method attractive. (C) 2009 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Aerobic Oxidative Coupling of Amides with Arylboronic Acids by Cooperative Catalysis
作者:Yue Li、Hongxiang Wu、Zhuo Zeng
DOI:10.1002/ejoc.201900531
日期:2019.7.23
A new conceptual method, the first fluoride and palladium co‐catalyzed conversion of amide to ester through an aerobic oxidative coupling pathway is reported. This work demonstrates the synergistic combination of fluoride and palladium catalysis as a new concept to activate inert amide N–C bonds, which may facilitate the growing utilization of amides as synthons in a variety of transformations.