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Synthesis 2010(15): 2588-2598
DOI: 10.1055/s-0029-1218840
DOI: 10.1055/s-0029-1218840
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
A Facile Synthesis of Annulated Thiatriazine Dioxides
Further Information
Received
1 March 2010
Publication Date:
25 June 2010 (online)
Publication History
Publication Date:
25 June 2010 (online)
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Abstract
The reactions of five-, six-, seven-, and eight-membered cyclic imido ethers with one equivalent of sulfamide lead to the corresponding sulfamoylamidines in 70-80% yields. Sulfamoylamidines undergo condensations with aliphatic and aromatic aldehydes as well as aliphatic ketones to give thiatriazine dioxides in 50-95% yields. The NMR spectroscopic studies reveal ring-chain tautomerism of some thiatriazine dioxides in solution. The ratio between the tautomers depends on the temperature, solvent polarity, and electronic properties of the substituents of the pendant aryl rings. Thiatriazine dioxides are readily alkylated and acylated at position 2.
Key words
imido ethers - sulfamide - sulfamoylamidines - thiatriazine dioxides - tautomerism
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