Microwave-assisted one-pot synthesis of 2,3-disubstituted 3H-quinazolin-4-ones
摘要:
A practical synthesis of 2,3-disubstituted 3H-quinazolin-4-ones 1 with broad chemistry scope is described. The key step is the microwave promoted one-pot, two-step reaction sequence combining anthranilic acids, carboxylic acids, and amines providing efficient access to this important class of heterocycles. (C) 2005 Elsevier Ltd. All rights reserved.
and pyrido[2,3-d]pyrimidin-4(3H)-ones from easily available 2-halobenzamides (or 2-halonicotinamides), aldehydes, and sodium azide has been developed, which gave the corresponding target products in 50–95% yields for 29 examples. This remarkable consecutive process involved sequential copper-catalyzed SNAr, reduction, cyclization, and oxidation. Notably, this work would provide a novel synthetic strategy
从容易获得的2-卤代苯甲酰胺(或2-卤代烟酰胺)中高效,实用地铜催化连续合成喹唑啉-4(3 H)-酮和吡啶并[2,3 - d ]嘧啶-4(3 H)-酮,已开发出醛和叠氮化钠,从而使29个实例的相应目标产物收率达到50-95%。这个非同寻常的连续过程涉及连续的铜催化的S N Ar,还原,环化和氧化。值得注意的是,这项工作将为含有喹唑啉酮类骨架的生物活性分子提供一种新颖的合成策略。
Ligand-Free Pd-Catalyzed and Copper-Assisted C–H Arylation of Quinazolin-4-ones with Aryl Iodides under Microwave Heating
A microwave-assisted method for the palladium-catalyzed direct arylation of quinazolin-4-one has been developed under copper-assistance. This method is applicable to a wide range of aryl iodides and substituted (2H)-quinazolin-4-ones. This protocol provides a simple and efficient way to synthesize biologically relevant 2-arylquinazolin-4-one backbones.
Pyrido[2,3-d]pyrimidine Derivatives: Synthesis via the Intermolecular Aza-Wittig Reaction/Heterocyclization and the Crystal Structure