Reaction of 2??dimethylaminomethylene??1, 3??diones with Dinucleophiles. IV. Synthesis of 5, 7??dihydrothiopyrano [3, 4??c] pyrazol??4 (1H)??ones, 5H??Thiopyrano [4, 3??d] …

G Menozzi, L Mosti, P Schenone

Index: Menozzi, Giulia; Mosti, Luisa; Schenone, Pietro Journal of Heterocyclic Chemistry, 1984 , vol. 21, p. 1437 - 1440

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Citation Number: 12

Abstract

Abstract The reaction of 2H-thiopyran-3, 5 (4H, 6H)-dione with N, N-dimethylformamide dimethyl acetal gave in good yield 4-dimethylaminomethylene-2H-thiopyran-3, 5 (4H, 6H) dione (II), which afforded 1-substituted 5, 7-dihydrothiopyrano [3, 4-c] pyrazol-4 (1H)-ones with aliphatic and aromatic hydrazines, 5H-thiopyrano [4, 3-d] isoxazol-4 (7H)-one (IV) with hydroxylamine hydrochloride and 2-substituted 6H-thiopyrano [3, 4-d] pyrimidin-5 (8H)- ...