for the condensation of α-ketimine esters with 2-aminoanilines for the construction of quinoxalin-2-one derivatives is described. The substrate scope with 2-aminoaniline derivatives and different α-ketoesters is explored with yields ranging from 44 to 90% and typical isolated regioselectivities between 6.4 to >25:1. A highly regioselective method for the condensation of α-ketimine esters with 2-aminoanilines
Visible-light-induced, copper(i)-catalysed C-N coupling between o-phenylenediamine and terminal alkynes: one-pot synthesis of 3-phenyl-2-hydroxy-quinoxalines
and terminal acetylenes was performed using simple copper(I) chloride as a catalyst for the synthesis of quinoxaline derivatives. The current method works well for a wide range of electron rich as well as electron poor group-substituted o-phenylenediamines and phenylacetylenes. The key component in the reaction is the direct photo-excitation of in situ generated copper arylacetylide (λabs = 420–480 nm)
an enzyme and visible-light catalysis for the synthesis of quinazoline derivatives from 2-aminobenzylamine and methyl benzoylformate is described for the first time. The reaction comprises enzyme-catalyzed hydrolysis, visible-light-activated decarboxylation, and oxidation cyclization. A series of reactions between 2-aminobenzylamine and different methyl benzoylformates afforded the corresponding products
Base promoted coupling of α-ketoacids and 2-substituted aromatic amines: Green synthesis of diverse benzoxazoles, benzothiazoles, quinoxalinones and benzoxazinones and its practical application
作者:Sivagami Mathavan、Subburethinam Ramesh、Rajesh B. R. D. Yamajala
DOI:10.1080/00397911.2023.2280599
日期:2024.1.2
Synthesis of 2-aryl substituted benzoxazoles, benzothiazoles, and quinoxalinones via decarboxylative coupling of α-keto acids with 2-aminophenol, 2-aminothiophenol, and OPD (o-phenylenediamine), us...