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Abstract 2‐Aza‐1,3‐butadiene derivatives 2 are synthesized by dimerization of imines 1. These azadienes are precursors of 5,6‐dihydro‐2H‐1,3‐oxazine derivatives 4 and 5 by means of a [4 + 2]cycloaddition reaction with aldehydes.
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Barluenga et al. (1985) studied this question.
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