Blackburn C, Achab A, Elder A, Ghosh S, Guo J, Harriman G, Jones M. Synthesis of 3-Amino-1,2,4-benzothiadi- azine 1,1-Dioxides via a Tandem Aza-Wittig/Heterocumulene Annulation.
J Org Chem 2005;
70:10206-9. [PMID:
16292875 DOI:
10.1021/jo051843h]
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Abstract
[reaction: see text] Reaction of o-azidobenzenesulfonamides with polymer-supported triphenylphosphine affords the corresponding iminophosphoranes. Subsequent reaction with isocyanates gives 3-amino-1,2,4-benzothiadiazine 1,1-dioxides in high yields and purities. The reaction has been successfully applied to the synthesis of derivatives with various substituents at the 2- and 3-positions and in the benzenoid ring.
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