title: Facile synthesis of benzothiadiazine 1,1-dioxides, a precursor of RSV inhibitors, by tandem amidation/intramolecular aza-Wittig reaction.
abstract: Reaction of o-azidobenzenesulfonamides with ethyl carbonochloridate afforded the corresponding amide derivatives, which gave 3-ethoxy-1,2,4-benzothiadiazine 1,1-dioxides through an intramolecular aza-Wittig reaction. The reaction was found to be general through the synthesis of a number of benzothiadiazine 1,1-dioxides. Acid-catalyzed hydrolysis of 3-ethoxy-1,2,4-benzothiadiazine 1,1-dioxides furnished the 2-substituted benzothiadiazine-3-one 1,1-dioxides in good yields and high purity, which is the core moiety of RSV inhibitors.
authors.affiliation: Department of Chemistry, University of Kalyani, Kalyani 741235, W.B India.
authors.forename: Krishna C
authors.initials: KC
authors.lastname: Majumdar
authors.forename: Sintu
authors.initials: S
authors.lastname: Ganai
keywords: 3-ethoxy-1,2,4-benzothiadiazine 1,1-dioxide; benzothiadiazine-3-one 1,1-dioxide; intramolecular aza-Wittig reaction; sultam