A green and efficient procedure for the synthesis of quinoxalines is reported starting from benzil and 1,2-diaminobenzene. The reactions were carried out under catalyst-free, solvent-free, and microwave-irradiation conditions, affording the corresponding quinoxalines. This method had many dramatic advantages, such as the short reaction time (2–6 min), high yields (71–98%), and environmental friendliness, as well as convenient operation.
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Zhou et al. (2009) studied this question.
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