Cycloaddition reactions of 1,3-benzothiazines—I.
作者:L. Fodor、J. Szabó、P. Sohár
DOI:10.1016/s0040-4020(01)97668-9
日期:1981.1
3-benzothiazine (1) and 6,7-dimethoxy-4-phenyl-2H-1,3-benzothiazine (2) react with substituted acetyl chlorides to give linearly, and new angularly condensed β-lactam derivatives (4,5). Heating of the latter compounds with hydrogen chloride in anhydrous ethanol leads to the formation of the corresponding 4H- and 2H-1,3-benzothiazinium chloride, respectively. The configurations of these compounds (the mutual
6,7-二甲氧基-2-苯基-4H-1,3-苯并噻嗪(1)和6,7-二甲氧基-4-苯基-2H-1,3-苯并噻嗪(2)与取代的乙酰氯反应,线性生成,和新的角缩合β-内酰胺衍生物(4,5)。后一化合物与氯化氢在无水乙醇中的加热分别导致形成相应的4H-和2H-1,3-苯并噻嗪鎓氯化物。这些化合物的构型(取代基相对于β-内酰胺环的相互位置)通过1 H和13 C研究确定,也利用了芳族溶剂引起的位移。