A novel photoisomerzation of 1,2-benzothiazine 1,1-dioxides to 1,3-benzothiazine 1,1-dioxides
作者:Ibrahim Elghamry、Dietrich Döpp、Gerald Henkel
DOI:10.1002/jhet.5570440416
日期:2007.7
2-bezothiazine 1,1-dioxides (3a-e) into 4-oxo-1,3-2H-benzothiazine 1,1-dioxides (4a-e) and 4-hydroxy-2-methyl-N-(pyridin-2-yl)-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide (PRX) into N-methyl saccharin (2) upon 254 nm irradiation in methanol or acetonitrile is reported. The structures of the products have been elucidated by spectroscopic methods and single crystal X-ray structure determination for 4a and
一种新颖的将4-羟基-1,2-苯并噻嗪1,1-二氧化物(3a-e)轻松转化为4-氧代-1,3-2 H-苯并噻嗪1,1-二氧化物(4a-e)和4-在甲醇中254 nm照射下,将羟基-2-甲基-N-(吡啶-2-基)-2 H -1,2-苯并噻嗪-3-羧酰胺1,1-二氧化物(PRX)转化为N-甲基糖精(2)或报告有乙腈。通过光谱方法和单晶X射线结构测定4a和4d阐明了产物的结构。