Vinylene carbonate: acetylation reagent rather than ethyne surrogate in rhodium-catalyzed annulation with amidines toward 4-methylquinazolines.
乙烯基碳酸酯:在铑催化的与酰胺合成4-甲基喹唑啉的环化反应中,作为乙炔代用试剂的乙酰化试剂。
Photocatalytic synthesis of 2,4‐substituted quinazolines via a one‐pot, three‐component reaction under catalyst‐free conditions
作者:Zongbo Xie、Xuehua Chen、Guofang Jiang、Qianwen Fan、Hong Yang、Zhanggao Le
DOI:10.1002/jhet.4810
日期:——
A novel, catalyst-free photoinduced synthesis of 2,4-substituted quinazoline using 2-amino-aryl ketone, an aldehyde, and ammonium acetate was developed. A series of 2,4-substituted quinazoline compounds were obtained via irradiating the reactants with a light-emitting diode light (18 W) at roomtemperature. The broad substrate range and excellent gram-scale experimental results demonstrate the versatility
Palladium-catalyzed one pot 2-arylquinazoline formation via hydrogen-transfer strategy
作者:Huamin Wang、Hui Chen、Ya Chen、Guo-Jun Deng
DOI:10.1039/c4ob01296h
日期:——
The palladium catalytic system was first applied to 2-arylquinazoline synthesis via hydrogen transfer methodology. Various (E)-2-nitrobenzaldehyde O-methyl oximes reacted easily with alcohols or benzyl amines to provide N-heterocyclic compounds in good to high yields. Similarly, the heterocyclic products could be prepared by the reaction of 1-(2-nitrophenyl)ethanone, urea and benzyl alcohols. In these reactions, the nitro group was reduced in situ by hydrogen generated from the alcohol dehydrogenation step.