Bifunctional Phosphine Ligand Enabled Gold‐Catalyzed Alkynamide Cycloisomerization: Access to Electron‐Rich 2‐Aminofurans and Their Diels–Alder Adducts
By using biphenyl-2-ylphosphines functionalized with a remote tertiary amino group as a ligand, readily available acetylenic amides are directly converted into 2-aminofurans devoid of any electron-withdrawing and hence deactivating/stabilizing substituents. These highly electron-rich furans have rarely been prepared, let alone applied in synthesis, because of their high reactivities and low stabilities
Oxidative Aminocarbonylation of Terminal Alkynes for the Synthesis of Alk-2-ynamides by Using Palladium-on-Carbon as Efficient, Heterogeneous, Phosphine-Free, and Reusable Catalyst
作者:Sandip T. Gadge、Mayur V. Khedkar、Satish R. Lanke、Bhalchandra M. Bhanage
DOI:10.1002/adsc.201200041
日期:2012.7.9
(Pd/C)‐catalyzed oxidativeaminocarbonylations of alk‐1‐ynes with secondary amines provide the corresponding alk‐2‐ynamides in a good to excellent yields. This new methodology is applicable for the synthesis of a wide range of biologically active alk‐2‐ynamide derivatives. The developed protocol avoids the use of phosphine ligands, with an additional advantage of palladium catalyst recovery and reuse for up
Efficient synthesis of alkynyl amides via aminocarbonylation of iodoalkynes
作者:Péter Szuroczki、Borbála Boros、László Kollár
DOI:10.1016/j.tet.2018.09.001
日期:2018.10
aminocarbonylated with tert-butylamine undercarbonmonoxide atmosphere in the presence of in situ palladium(0) catalysts. The formation of the unsaturated carboxamide (alkynyl amide) is always accompanied by that of the Glaser coupling product, diphenylbutadiyne. The yield of the amide-forming reaction was optimised by the systematic variation of the phosphine ligand, carbonmonoxide pressure and temperature.
Thiuram Disulfide Mediated Cu-Catalyzed Amidation of Terminal Alkynes: An Efficient Synthesis of Alkynyl Amides
作者:Sourav Mondal、Soumya Mondal、Amit Saha
DOI:10.1021/acs.joc.3c01961
日期:2024.2.16
Terminalalkynes undergo a CO-free aminocarbonylation reaction mediated by thiuram disulfides. Thiuram disulfide acts as the source of the carbamoyl group in the amidation of terminalalkynes in the presence of copper-based reagent and catalyst. A series of alkynyl amides has been prepared with several structural variations following the current one-pot two-step protocol. The reaction proceeds through