An one-pot approach to the synthesis of triazolobenzothiadiazepine 1,1-dioxide derivatives by basic alumina-supported azide–alkyne [3+2] cycloaddition
作者:K.C. Majumdar、Sintu Ganai、Biswajit Sinha
DOI:10.1016/j.tet.2012.07.040
日期:2012.9
An efficient one-pot strategy for the synthesis of triazolobenzothiadiazepine 1,1-dioxidederivatives has been developed by the reaction of 2-azido-N-substituted benzenesulfonamides and propargyl bromide in basic alumina under microwave condition via [3+2] azide–alkyne cycloaddition reaction. This protocol has synthetic advantages in terms of low environmental impact and short reaction time.
Facile synthesis of benzothiadiazine 1,1-dioxides, a precursor of RSV inhibitors, by tandem amidation/intramolecular aza-Wittig reaction
作者:Krishna C Majumdar、Sintu Ganai
DOI:10.3762/bjoc.9.54
日期:——
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