SYNTHESIS OF N-ARYL SUBSTITUTED 4<i>H</i>-1,4-BENZOTHIAZINE 1,1-DIOXIDE 2-CARBOXYLIC ACID-ESTERS
作者:Simon E. Lopez、Jaime Charris、Neudo Urdaneta、Gricela Lobo
DOI:10.1080/10426509808045484
日期:1998.12.1
Abstract A group of N-aryl substituted 1,4-benzothiazine-1,1-dioxide-2 carboxylic acid esters is reported. This is the first example of N-aryl-derivatives of the 4H-1,4-benzothiazine nucleus; the key step is the cyclization of N-aryl-phenylsulfonyl-acrylates 4–8 using potassium carbonate in acetonitrile/18-crown-6-ether to the corresponding title compounds in moderate yields.
摘要 报道了一组N-芳基取代的1,4-苯并噻嗪-1,1-二氧化物-2 羧酸酯。这是 4H-1,4-苯并噻嗪核的 N-芳基衍生物的第一个例子;关键步骤是在乙腈/18-冠-6-醚中使用碳酸钾将 N-芳基-苯磺酰基-丙烯酸酯 4-8 环化为相应的标题化合物,收率适中。