Aminodienylesters. II. A New Synthesis of 2, 3-Dihydro-6H-1, 3-oxazines by Heterocyclic Annelation Reactions of sec-Aminodienylesters with Acetaldehyde

Abstract

The reactions of sec-aminodienylesters 2, which were prepared by the reactions of methyl 5-(N, N-dimethylamino)-2, 4-pentadienoate (tert-aminodienylester 1) with primary amines, with acetaldehyde afforded 2, 3-dihydro-6H-1, 3-oxazines 3, providing a new heterocyclic annelation reaction.