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
邻叠氮基苯磺酰胺与乙基碳酰氯反应生成相应的酰胺衍生物,通过分子内氮杂-维蒂希反应生成 3-乙氧基-1,2,4-苯并噻二嗪 1,1-二氧化物。通过合成许多苯并噻二嗪 1,1-二氧化物,发现该反应是普遍的。3-乙氧基-1,2,4-苯并噻二嗪 1,1-二氧化物的酸催化水解以良好的收率和高纯度提供了 2-取代的苯并噻二嗪-3-酮 1,1-二氧化物,这是 RSV 的核心部分抑制剂。