Carbonyl-containing spiro-dihydrofurans in reactions with ammonium acetate and hydrazine hydrate

It has been shown that 2-spiro(3-R-6,6-dimethyl-4-oxo-2,3,4,5,6,7-hexahydrobenzofuran)-2′-(5′, 5′-dimethylcyclohexane-1′,3′-diones) undergo conversions in reactions with ammonium acetate and hydrazine hydrate into substituted dihydropyridin-2-ones and tetrahydro-1,2-diazepin-7-ones respectively as a result of ring-opening of the spirodimedonyl fragment through the corresponding amides and hydrazides of δ-keto acids. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1800–1804. December, 2005.