Graphite catalyzed green synthesis of quinoxalines
作者:Hari K. Kadam、Salman Khan、Rupesh A. Kunkalkar、Santosh G. Tilve
DOI:10.1016/j.tetlet.2012.12.041
日期:2013.2
A new simple approach using environmentally benign, cheap, and easily recyclable graphite as a heterogeneous catalyst for the synthesis of quinoxalines is described. A library of pharmacologically interesting diphenylquinoxalines is prepared by the double condensation of substituted benzils, phenanthrene-9,10-dione, and benzoin with aromatic diamines in 71–93% yields at room temperature in ethanol
The cycloaddition behavior of dihydropyrazines towardketenes was investigated using single-crystal X-ray structures of the cycloadducts and density functional theory (DFT) calculation data. The reaction proceeds via a stepwise pathway involving an orientation complex prior to formation of the betaine intermediate. This is followed by electrocyclization to afford the 1 : 1 and 1 : 2 adducts bearing
Arylative Methylation of 2,3-Dihydropyrazines and Pyrazinones Using Dimethyl Sulfoxide as a C1 Source
作者:Kuntal Palit、Nayim Sepay、Niranjan Panda
DOI:10.1021/acs.joc.2c02675
日期:2023.3.3
pyrazinones using dimethyl sulfoxide as a nonconventional methylating agent under metal-free conditions was reported. Dimethyl sulfoxide-coordinated bromine cation pools generated from the treatment of dimethyl sulfoxide and 1,2-dibromoethane undergo Pummerer-type fragmentation to afford an electrophilic methyl(methylene)sulfonium ion for reaction with a carbon nucleophile followed by aromatization
Microwave-Assisted Synthesis of Quinoxalines in PEG-400
作者:Xia-Zhong Zhang、Jin-Xian Wang、Lin Bai
DOI:10.1080/00397911.2010.496134
日期:2011.7.15
[image omitted] A rapid and efficient procedure for the synthesis of quinoxaline derivatives has been achieved by condensation of aryl-1,2-diamines with 1,2-dicarbonyl compounds catalyzed by polyethylene glycol under CEM-focused microwave-irradiation conditions.
Mason, Journal of the Chemical Society, 1893, vol. 63, p. 1288