UNEXPECTED DESULFONATION OF α-PHENYLSULFONYL ENAMINOACRYLATES DURING THEIR CYCLISATION TO NEW N-ARYL 4H-1,4-BENZOTHIAZINE-l,l-DIOXIDES
作者:Simón E. López、Jaime Charris、Neudo Urdaneta、Carlos E. Canelón、José Salazar、Julio Herrera、Jorge E. Angel
DOI:10.1080/10426500108040258
日期:2001.8
Abstract An unexpected desulfonation of α-phenylsulfonyl-enaminoacrylates occurred during their cyclisation to novel 6,7-dichloro-N-aryl-4H-1,4-benzothiazine-1,1-dioxides using potassium carbonate and silver nitrate in DMF. This last cyclisation step was not completed in five hours of reaction but, instead of higher yields of the desired cyclic 4H-benzothiazines, a mixture of the above mentioned target
摘要 α-苯基磺酰基-烯氨基丙烯酸酯在 DMF 中使用碳酸钾和硝酸银环化成新型 6,7-二氯-N-芳基-4H-1,4-苯并噻嗪-1,1-二氧化物时发生了意想不到的脱磺反应。这最后的环化步骤在反应的五小时内没有完成,而是获得了上述目标化合物和脱磺化的 N-甲酰基-2-芳基-烯基-丙烯酸酯的混合物,而不是更高产率的所需环状 4H-苯并噻嗪。