Unlock the C–N Bond Amidation of Enaminones: Metal-Free Synthesis of Enamides by Water-Assisted Transamidation
作者:Haozhi Wu、Kang Chen、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.joc.3c01926
日期:2024.1.5
The C–N bond transamidation of primary amides with N,N-dimethyl enaminones has been efficiently realized by heating in the presence of trifluoromethanesulfonic acid (TfOH). The method enables the practical synthesis of valuable enamides without the use of any metal reagent. In addition, this transamidation protocol can also be expanded to the reactions of sulfonamides, and the late-stage functionalization
Stereoselective Synthesis of Enamides by Pd-Catalyzed Hydroamidation of Electron Deficient Terminal Alkynes
作者:Niranjan Panda、Raghavender Mothkuri
DOI:10.1021/jo301772f
日期:2012.10.19
Hydroamidation of electron-deficient terminal alkynes by amides in presence of Pd catalyst has been exploited for the stereoselective synthesis of Z-enamides. The possible intramolecular hydrogen bonding between the amido proton and carbonyl oxygen of ester group provides the extra stability to the Z-isomer of vinyl palladium complex, which subsequently undergoes protodepalladation and leads to the Z-enamide selectively. This process is found to be mild and operationally simple with broad substrate scope.