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2,2-Dioxo-1H-thieno[3,4-c][1,2]thiazines. Synthesis and some reactions of a new heterocycle

✍ Scribed by Egon Fanghänel; Hagen Bartossek; Ute Baumeister; Matthias Biedermann; Helmut Hartung

Publisher
Journal of Heterocyclic Chemistry
Year
1998
Tongue
English
Weight
467 KB
Volume
35
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

The first synthesis of substituted 2,2‐dioxo‐1‐phenyl‐1__H__‐thieno[3,4‐c][1,2]thiazines 2 and some of their reactions are achieved. Compounds 2 were prepared from the 3,5‐dimethyl‐1,1‐dioxo‐1,2‐thiazine‐4‐carbaldehydes 1 by reaction with sulfur and triethyl amine in dimethylformamide under mild conditions. They were characterized spectroscopically and by X‐ray structure analysis. The formylation, chlorination and oxidation of 2 are reported.

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