Abstract
Abstract Diazabicyclo compounds possessing an α-nitrolactam framework were directly synthesized upon treatment of α-nitro-δ-keto esters with diamines. This reaction proceeds via pseudo-intramolecular process. In this process, the formation of ammonium nitronate is a key step, by which the amino group and the ketone carbonyl group are in close proximity to cause the imine formation efficiently. The following tandem bicyclization constructs 1,7-diaza-3-nitro-2-oxobicyclic systems having two aryl groups at the 4- and 6-positions.
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