Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 2, Issue 5, Pages 788-796Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b315689c
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alpha-Hydroxy ketones undergo manganese dioxide-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 dicarbonyl intermediates. The scope and limitations of these procedures are outlined and modi. cations to this procedure are discussed in which reduction is carried out in the same reaction vessel, generating piperazines, or oxidation, leading to pyrazines.
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