Cobalt-Catalyzed Synthesis of Unsymmetrically <i>N</i>,<i>N</i>-Disubstituted Formamides via Reductive Coupling of Primary Amines and Aldehydes with CO<sub>2</sub> and H<sub>2</sub>
作者:Zhengang Ke、Zhenzhen Yang、Zhenghui Liu、Bo Yu、Yanfei Zhao、Shien Guo、Yunyan Wu、Zhimin Liu
DOI:10.1021/acs.orglett.8b02384
日期:2018.11.2
Herein, a novel route to synthesize unsymmetrically N,N-disubstituted formamides is reported, which is achieved via reductive coupling of primary amine and aldehyde with CO2/H2 over a cobalt-based catalytic system composed of CoF2, P(CH2CH2PPh2)3 and K2CO3. The mechanism investigation indicates that a secondary amine is formed via hydrogenation of the imine originated from aldehyde and primary amine
本文中,报道了一种新颖的合成不对称的N,N-二取代甲酰胺的途径,该途径是通过在由CoF 2,P(CH 2)组成的钴基催化体系上伯胺和醛与CO 2 / H 2的还原偶联而实现的。CH 2 PPh 2)3和K 2 CO 3。机理研究表明,仲醛是通过醛和伯胺中亚胺的加氢反应生成的,它进一步与CO 2氢化生成的HCOOH反应,最终形成NNFA。
BENZO-OR PYRIDO-IMIDAZOLE DERIVATIVE
申请人:Fujita Takashi
公开号:US20130165446A1
公开(公告)日:2013-06-27
The present invention addresses the problem of finding a compound having both PPAR activation activity and angiotensin receptor antagonistic activity. The present invention is a benzo- or pyrido-imidazole derivative represented by general formula (I), a pharmaceutically acceptable salt thereof, or a ester or amide thereof (where A is biphenyl methyl-imidazolyl, biphenyl methyl-benzimidazolyl, or the like, B is divalent benzimidazolyl or the like, C is carboxyl or the like, E is divalent phenyl, naphthyl, or the like, G is a dangling bond, oxygen, or the like, Q is oxygen or sulfur, n is an integer from 1 to 6, p is an integer from 1 to 6, V is a dangling bond, oxygen, or the like, and R is hydrogen, alkyl, or the like).
The present invention addresses the problem of finding a compound having both PPAR activation activity and angiotensin receptor antagonistic activity. The present invention is a benzo- or pyrido-imidazole derivative represented by general formula (I), a pharmaceutically acceptable salt thereof, or a ester or amide thereof (where A is biphenyl methyl-imidazolyl, biphenyl methyl-benzimidazolyl, or the like, B is divalent benzimidazolyl or the like, C is carboxyl or the like, E is divalent phenyl, naphthyl, or the like, G is a dangling bond, oxygen, or the like, Q is oxygen or sulfur, n is an integer from 1 to 6, p is an integer from 1 to 6, V is a dangling bond, oxygen, or the like, and R is hydrogen, alkyl, or the like).
Intramolecular and intermolecular Schmidt reactions of alkyl azides with aldehydes
作者:Huey-Lih Lee、Jeffrey Aubé
DOI:10.1016/j.tet.2007.05.079
日期:2007.9
Despite recent advances in the use of alkyl azides in ring expansion reactions of ketones, there has been little work done on the corresponding chemistry of aldehydes. In the present study, the Lewis acid-promoted reactions of alkyl azides with aldehydes were studied in both intermolecular and intramolecular contexts. The intramolecular reactions of azidoalkyl aldehydes in which the azide and carbonyl groups were separated by 2-5 carbons were examined. Although the examples having the shortest tether failed (3-azidopropanals), each of the other systems gave good yields of either NH-substituted lactams (resulting from hydride migration in the initially formed azidohydrin adduct) or formamides (alkyl migration). The product formed was dependent on the chain length of the starting azido aldehyde. The intermolecular reactions were less efficient, requiring TiCl4 promotion for even moderate yields, and in each case gave mixtures of products resulting from hydride and alkyl migration. (C) 2007 Elsevier Ltd. All rights reserved.