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。
Efficient Microwave Access to Polysubstituted Amidines from Imidoylbenzotriazoles
作者:Alan R. Katritzky、Chunming Cai、Sandeep K. Singh
DOI:10.1021/jo052443x
日期:2006.4.1
Microwave reactions of primary and secondary amines with imidoylbenzotriazoles 6a-w gave diversely substituted amidines 7a-Aa in 76-94% yields. Convenient preparations of a variety of amides 5a-Ab (87-96%) and imidoylbenzotriazoles 6a-w (56-95%) have also been developed using microwave irradiation under mild conditions and short reaction times. These results demonstrate further the advantages of microwave synthesis and introduce a new application of imidoylbenzotriazoles in the preparation of polysubstituted amidines.
Strain, Journal of the American Chemical Society, 1928, vol. 50, p. 2221
作者:Strain
DOI:——
日期:——
Transition Metal-Free Visible Light-Driven Photoredox Oxidative Annulation of Arylamidines
作者:Zi-chao Shen、Pan Yang、Yu Tang
DOI:10.1021/acs.joc.5b02366
日期:2016.1.4
A fast catalytic synthesis of multisubstituted quinazolines from readily available amidines via visible light-mediated oxidative C(sp(3))-C(sp(2)) bond formation has been established. This reaction is a metal-free oxidative coupling catalyzed by a photoredox organocatalyst. The protocol features low catalyst loading (1 mol %).
Solvent/Oxidant-Switchable Synthesis of Multisubstituted Quinazolines and Benzimidazoles via Metal-Free Selective Oxidative Annulation of Arylamidines
作者:Jian-Ping Lin、Feng-Hua Zhang、Ya-Qiu Long
DOI:10.1021/ol500864r
日期:2014.6.6
A fast and simple divergent synthesis of multisubstituted quinazolines and benzimidazoles was developed from readily available amidines, via iodine(III)-promoted oxidative C(sp(3))-C(sp(2)) and C(sp(2))-N bond formation in nonpolar and polar solvents, respectively. Further selective synthesis of quinazolines in polar solvent was realized by TEMPO-catalyzed sp(3)C-H/sp(2)C-H direct coupling of the amidine with K2S2O8 as the oxidant. No metal, base, or other additives were needed.