Synlett

Synthesis and Reactivity of 3, 4-Dimethyl-4H-1, 3, 4-thiadiazines

WD Pfeiffer, E Dilk, H Rossberg, P Langer

Index: Pfeiffer, Wolf-Diethard; Dilk, Erich; Rossberg, Harald; Langer, Peter Synlett, 2003 , # 15 p. 2392 - 2394

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Citation Number: 10

Abstract

Abstract 3, 4-Dimethyl-4H-1, 3, 4-thiadiazines, novel 8π heterocyclic systems, were prepared by cyclization of α-haloketones with 1, 2, 4-trialkylthiosemicarbazides. The desulfurization of the products afforded 5-imino-1, 2-dimethylpyrazoles by valence isomerization into thia-σ-homopyrazoles.