Abstract
The reaction of benzoxazoles with aromatic and aliphatic acids, which gives transcyclization products — 2-substituted benzoxazoles — was studied. The reaction of 2-hydroxyacetanilide with aliphatic acids gives a mixture of 2-substituted benzoxazoles. Under similar conditions, 2-methylbenzothiazole, 2-alkyl-Δ2-oxazolines, and 2-alkyl-Δ2-thiazolines do not undergo transcyclization, but ring opening is observed in the latter two cases.
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