Syntheses and chemical properties for 4
H-1, 3-oxazin-4-one (1) and 6
H-1, 3-oxazin-6-one (2), which have appeared in the literature since 1980, are reviewed, including methods for the preparation of 1 by [4π+2π] cycloaddition reaction and dehydration-cyclization of acylacetylcarboxamides, and of 2 by thermal cyclization via
N-acyliminoketene.
Ring transformations of 1 and 2, such as the ring-opening of 1 followed by recyclization, and cycloaddition reaction of 2 as an azadiene, are discussed therein.
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