Triphenyl borate catalyzed synthesis of amides from carboxylic acids and amines
作者:Seema A. Ghorpade、Dinesh N. Sawant、Nagaiyan Sekar
DOI:10.1016/j.tet.2018.10.030
日期:2018.11
Herein we report triphenyl borate as a new catalyst for synthesis of amides by catalytic condensation of carboxylic acids and amines. Our protocol is applicable for synthesis of wide range of amides furnishing excellent yields up to 92%. In addition developed method requires low catalyst loading, short time, less amount of solvent, works under air atmosphere and notably no need of azeotropic reflux
isocyanates at the benzylic position upon irradiation with visiblelight in the presence of an iridium photoredox catalyst, a bromide anion, and a nickel catalyst, producing N-substituted α-aryl amides. An analogous carbamoylation reaction of aliphatic C–H bonds of alkanes took place when UV light and a diaryl ketone were used instead of visiblelight and the iridium complex. The present reaction offers
Efficient catalyst-free direct amidation of non-activated carboxylic acids from carbodiimides
作者:Mehmet Mart、Janusz Jurczak、Idris Karakaya
DOI:10.1039/d2ob01322c
日期:——
A novel and efficient catalyst- and activating agent-free amidationmethod via direct amidation of carboxylic acids where carbodiimides act as a reagent instead of an activating agent is reported. The reaction is conducted under non-traditional coupling conditions where a higher temperature is employed. Besides not using stoichiometric ratios of activating agent or catalyst, this approach is made even