Heterocyclic Compounds
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ChemInform Abstract: Pyrano(3,2-c)(1,2)benzothiazine 5,5-Dioxide Derivatives: Synthesis and Structural Assignment.
First published: November 27, 1990
Abstract
The reaction of the enamines (II), (V), or (VIII) with the dihydrobenzothiazinone S,S-dioxides (I) gives the heterocycles (III) exclusively, the diastereomeric mixtures (VI) + (VII), or the configurationally undetermined heterocycles (IX), respectively.
ChemInform Abstract
The reaction of the enamines (II), (V), or (VIII) with the dihydrobenzothiazinone S,S-dioxides (I) gives the heterocycles (III) exclusively, the diastereomeric mixtures (VI) + (VII), or the configurationally undetermined heterocycles (IX), respectively. The treatment of these adducts with acid leads to deaminated pyrano-benzothiazines as exemplified in the scheme for (III) (→ (IV)).
