Facile One‐Pot Synthesis of 4‐Hydroxy‐2‐methyl‐(2H)‐1,2‐benzothiazine‐3‐sulfonic Acid 1,1‐Dioxide
作者:Waseeq A. Siddiqui、Saeed Ahmad、Islam Ullah Khan、Hamid Latif Siddiqui、George W. Weaver
DOI:10.1080/00397910601131437
日期:2007.3
convenient synthesis of 4‐hydroxy‐2‐methyl‐(2H)‐1,2‐benzothiazine‐3‐sulfonic acid‐1,1‐dioxide (6a) prepared in a novel one‐pot reaction. The synthesis involves two transformations starting from 2‐methyl‐2H‐1,2‐benzothiazin‐4‐(3H)‐one 1,1‐dioxide (7) with an overall yield better than that from the stepwise process, as well as the alternate procedure starting from saccharin (1). One‐pot synthesis of an important
摘要 我们报告了一种在新型单锅反应中制备的 4-羟基-2-甲基-(2H)-1,2-苯并噻嗪-3-磺酸-1,1-二氧化物 (6a) 的简便合成方法。该合成涉及从 2-甲基-2H-1,2-苯并噻嗪-4-(3H)-one 1,1-二氧化物 (7) 开始的两次转化,其总产率高于分步法,以及从糖精 (1) 开始的替代程序。还描述了重要中间体糖精-N-甲磺酸 (4) 的一锅法合成。