Expedient entry into 1,4-dihydroquinoxalines and quinoxalines via a novel variant of isocyanide-based MCR.

[摘要]：A novel multicomponent reaction of o-phenylenediamines with aldehydes and isonitriles yields 1,4-dihydroquinoxalines. These intermediates are unstable under reaction conditions. They undergo oxidn. with DDQ to furnish 33-54% isolated yields of the resp. quinoxalines. This reaction is general for arom. 1,2-diamines. Monoalkylated aryl 1,2-diamines lead to stable 1,4-dihydroquinoxalines.

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