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Beilstein J. Org. Chem. 2010, 6, No. 52, doi:10.3762/bjoc.6.52
Graphical Abstract
Scheme 1: Synthetic plan towards quinoxaline derivatives.
Scheme 2: Preparation of o-alkynyl carbonyl derivatives 1. A: pyrazine series; B,C: quinoxaline series.
Scheme 3: Synthesis of quinoxaline derivative.
Scheme 4: Synthesis of azahydrophenanthrone derivatives.