Four-component quinazoline synthesis from simple anilines, aromatic aldehydes and ammonium iodide under metal-free conditions
作者:Jinjin Chen、Dan Chang、Fuhong Xiao、Guo-Jun Deng
DOI:10.1039/c8gc02654h
日期:——
A four-component procedure for the preparation of substituted quinazolines from anilines, aromaticaldehydes and ammonium iodide is described. The C–H bond ortho to the amino group in anilines was directly functionalized undermetal-freeconditions. Two aldehydes were involved in this reaction and ammonium iodide was used as one of the nitrogen sources. This reaction provides a strategy for the facile
The first example of the palladium-catalyzed, three-component tandem reaction of 2-aminobenzonitriles, aldehydes, and arylboronic acids has been developed, providing a new approach for one-pot assembly of diverse quinazolines in moderate to good yields. A noteworthy feature of this method is the tolerance of bromo and iodo groups, which affords versatility for further synthetic manipulations. Preliminary
Ru(II)-Catalyzed C–H Activation and Annulation Reaction via Carbon–Carbon Triple Bond Cleavage
作者:Rashmi Prakash、Bidisha R. Bora、Romesh C. Boruah、Sanjib Gogoi
DOI:10.1021/acs.orglett.8b00643
日期:2018.4.20
An unprecedented Ru(II)-catalyzed C–H activation and annulation reaction, which proceeds via C–C triple bond cleavage, is reported. This reaction of 2-phenyldihydrophthalazinediones with alkynes, which works most efficiently in the presence of bidented ligand 1,3-bis(diphenylphosphino)propane, affords good yields of substituted quinazolines.
Silver(II) oxide-mediated synthesis of 2,4-diarylquinazolines
作者:Wing Cheung、Raymond J. Patch、Mark R. Player
DOI:10.1016/j.tetlet.2018.05.019
日期:2018.6
4-diarylquinazolines is described which involves a silver oxide-mediated CH activation/CN bond formation process. The generality of this method with respect to substituent effects is presented along with studies leading to process optimization. Mechanistic investigations provide support for the involvement of radical intermediates in the reaction process.
描述了合成2,4-二芳基喹唑啉的单釜法,该法涉及氧化银介导的C H活化/ C N键形成过程。提出了有关取代基效应的通用方法以及导致工艺优化的研究。机理研究为自由基中间体参与反应过程提供了支持。
An Efficient Protocol for the Synthesis of 2-Phenylquinazolines Catalyzed by Ceric Ammonium Nitrate (CAN)
activators. 3 Very re- cently Wang et al., reported an elegant synthesis of 2-phe- nylquinazolines employing molecular iodine/TBHP and also with supported copper oxide nanoparticles. 4 Truong et al. described copper-catalyzed Ullmann N-arylation coupling process to synthesize 2-phenylquinazolines from the corresponding o-iodobenzaldehydes and benzamidine hydrochloride under ligand-free conditions. 5 However