Copper-catalyzed synthesis of α,β-unsaturated acylamides via direct amidation from cinnamic acids and N-substituted formamides
作者:Hong Yan、Hailong Yang、Linhua Lu、Defu Liu、Guangwei Rong、Jincheng Mao
DOI:10.1016/j.tet.2013.06.078
日期:2013.9
A highly effective synthesis of α,β-unsaturated acylamides is reported for the first time via copper-catalyzed direct amidation between readily available cinnamic acids and N-substituted formamides. The protocol was easily accessible and practical.
AbstractReactions of benzaldehydes with excess N,N-dimethylacetamide at 140 °C in the presence of diethyl carbonate as dehydrating agent and a base gave (E)-N,N-dimethylcinnamamides in good yields. If hydroxybenzaldehydes are used as substrates the reaction is accompanied by alkylation. Graphical abstract
Substituted 2-amino-[1,2,4]triazolo[1,5-a]pyrimidine derivative and use thereof
申请人:Kuramochi Hiroshi
公开号:US20070129383A1
公开(公告)日:2007-06-07
Disclosed is a [1,2,4]triazolo[1,5-a]pyrimidine derivative represented by the general formula (I) below or a pharmaceutically acceptable salt thereof. Also disclosed is a medicine containing such a derivative or a salt thereof as an active constituent.
In the formula, Ar represents a phenyl group which may have a substituent or a 5- or 6-membered aromatic heterocyclic ring which contains one heteroatom and may have a substituent, and R represents a (C
1
-C
6
) alkyl group which may be substituted or the like.
SUBSTITUTED 2-AMINO- 1,2,4 TRIAZOLO 1,5-a PYRIMIDINE DERIVATIVE AND USE THEREOF
申请人:NIPPON KAYAKU KABUSHIKI KAISHA
公开号:EP1674454A1
公开(公告)日:2006-06-28
Disclosed is a [1,2,4]triazolo[1,5-a]pyrimidine derivative represented by the general formula (I) below or a pharmaceutically acceptable salt thereof. Also disclosed is a medicine containing such a derivative or a salt thereof as an active constituent.
In the formula, Ar represents a phenyl group which may have a substituent or a 5- or 6-membered aromatic heterocyclic ring which contains one heteroatom and may have a substituent, and R represents a (C1-C6) alkyl group which may be substituted or the like.
The Heck Reaction of β-Arylacrylamides: An Approach to 4-Aryl-2-quinolones
作者:Sandro Cacchi、Giancarlo Fabrizi、Roberta Bernini、Ilse De Salve
DOI:10.1055/s-2006-951505
日期:2006.11
The Heck reaction of β-arylacrylamides with aryl iodides afforded the corresponding vinylic substitution products usually in high yields. The nature of β-substituents, aryl iodides and substituents at the nitrogen atom influences the stereochemical outcome. N,N-Dimethyl-β-arylacrylamides gave vinylic substitution products with higher stereoselectivity than the corresponding N-unsubstituted β-arylacrylamides. β-Arylacrylamides containing ortho-substituents led to the formation of only one stereoisomer. The procedure was used to prepare 4-aryl-2-quinolones from β-(o-bromophenyl)acrylamide through a sequential Heck reaction and copper-catalyzed cyclization process.