Facile preparation of amides from carboxylic acids and amines with ion-supported Ph3P
作者:Yuhsuke Kawagoe、Katsuhiko Moriyama、Hideo Togo
DOI:10.1016/j.tet.2013.03.021
日期:2013.5
rimethylammonium bromide (IS-Ph3P), could be used for the facile amidation of a wide range of carboxylicacids with amines in the presence of bromotrichloromethane to provide the corresponding amides in good yields. In the present reaction, the desired amides were obtained in good yields with high purity by simple extraction of the reaction mixture with diethyl ether or chloroform and subsequent removal
Rapid access to cinnamamides and piper amides <i>via</i> three component coupling of arylaldehydes, amines, and Meldrum's acid
作者:Santanu Ghosh、Chandan K. Jana
DOI:10.1039/c9gc02937k
日期:——
A practical method for the synthesis of cinnamamides and piper amides via a conceptually novel three component reaction of aldehydes, amines and Meldrum's acid has been reported. The reaction proceeds under operationally simple conditions without the aid of coupling reagents, oxidants, or catalysts, which are essential for the preparation of cinnamamides/piper amides via known methods. The formation
The triflic acid-mediated cyclisation of N-benzylcinnamanilides
作者:Frank D. King、Stephen Caddick
DOI:10.1016/j.tet.2013.07.075
日期:2013.10
N-Benzylcinnamanilides cyclise with triflic acid to form 1-benzyl-4-aryl-2,4-dihydro-1H-quinolin-2-ones and 2,5-diaryl-benzazepin-3-ones. The product ratio is determined by the preferred orientation of the amide and by the electronics of the substituents. With ortho-substituted anilides, N-debenzylation also occurs to give 4-aryl-2,4-dihydro-1H-quinoline-2-ones. (C) 2013 Elsevier Ltd. All rights reserved.
The triflic acid-mediated cyclisation of N-benzyl-cinnamamides
作者:Frank D. King、Stephen Caddick
DOI:10.1016/j.tet.2012.11.035
日期:2013.1
N-Benzyl-cinnamamides cyclise with triflic acid to form 5-aryl-benzazepinones and/or cinnamamides. (c) 2012 Elsevier Ltd. All rights reserved.