Herein the first example of electrochemically enabled, NiCl2-catalyzed reductive decarboxylative coupling of N-hydroxyphthalimide (NHP) esters with quinoxalinones is reported. A range of primary, secondary, tertiary aliphatic carboxylic acids and amino acid-derived esters were tolerated well. This decarboxylative coupling allows access to structurally diverse 3-alkylated quinoxalinones in up to 91%
Alkyl Carbazates for Electrochemical Deoxygenative Functionalization of Heteroarenes
作者:Yongyuan Gao、Zhengguang Wu、Lei Yu、Yi Wang、Yi Pan
DOI:10.1002/anie.202001571
日期:2020.6.26
work describes carbazate as a new type of electrochemically activated alkylatingagent derived from ubiquitous alcohols for direct functionalization of heteroarenes under mild electrolytic conditions. The simple undivided cell at low oxidative potentials with carbon/platinum electrode set‐ups offers excellent substrate tolerance, affording a variety of primary, secondary and tertiary alkyl‐decorated
Synthesis of γ-Butyrolactones, Quinoxalines, and Azauracils from 4-Aryl-2-oxobutanoic Acid Derivatives
作者:G. H. Labib、M. Abdel Rahman、Y. El-Kilany、A. I. El-Massry、E. S. H. El-Ashry
DOI:10.1246/bcsj.61.4427
日期:1988.12
the corresponding 4-aryl-2-oxobutanoic acids (1). The anticipated products from the reaction of the furanones (2) with o-phenylenediamine (3) have not been isolated, but products resulting from the condensation followed by retro-aldol type of reaction are obtained and determined as 3-(2-arylethyl)-2(1H)-quinoxalinones (4). Compounds 4 could be readily obtained by the condensation of 3 with 1. 4-Aryl-2-oxobutanoic
作者:V. A. Mamedov、A. M. Murtazina、A. T. Gubaidullin、E. A. Khafizova、I. Kh. Rizvanov、I. A. Litvinov
DOI:10.1007/s11172-010-0289-7
日期:2010.8
3-(2-aryl-2-oxoethylidene)-3,4-dihydroquinoxalin-2(1H)-ones with hydrazine hydrate (and phenylhydrazine), in boiling aceticacid undergo new acid-catalyzed rearrangement with the contraction of pyrazine ring of the quinoxaline system to form 2-(pyrazol-3-yl)benzimidazoles. Possible mechanisms of this rearrangement are considered.