Preparation of quinoxalines, dihydropyrazines, pyrazines and piperazines using tandem oxidation processes
作者:Steven A. Raw、Cecilia D. Wilfred、Richard J. K. Taylor
DOI:10.1039/b307177b
日期:——
α-Hydroxyketones undergo MnO2-mediated oxidation followed by in situ trapping with aromatic or aliphatic 1,2-diamines to give quinoxalines or dihydropyrazines, respectively, in a one pot procedure which avoids the need to isolate the highly reactive 1,2-dicarbonyl intermediates. Modifications of the procedure allow the formation of pyrazines and piperazines.