Reactions of 3-substituted 2-methylenebenzothiazolines, generated in situ from the corresponding 2-methylbenzothiazolium salts and triethylamine, with 3-(2,3-diphenyl-2-cyclopropenylidene)pentane-2,4-dione give 3a,9-dihydrocyclopenta[b][1,4]benzothiazine derivatives.
由相应的
2-甲基苯并噻唑鎓盐和
三乙胺原位生成的 3-取代 2-亚甲基
苯并噻唑与 3-(2,3
-二苯基-2-环
丙烯亚基)
戊烷-2,4-二酮反应生成 3a,9-二氢环戊并[b][1,4]苯并
噻嗪衍
生物。