Regiospecific denitrogenative cleavage and chemoselective N-desulfonylation of benzotriazoles and benzotriazinones by aluminum halides are investigated. Products of these transformations are dependent on the N-substituents as well as the aluminum halides. For benzotriazoles bearing an N-hydroxy or acetyl substituent, denitrogenative cleavage occurs that affords 2′-iodoacetanilides as the products when
研究了卤化铝对苯并三唑和苯并
三嗪酮的区域特异性脱氮裂解和
化学选择性N-脱磺酰化。这些转变的产物取决于N-取代基以及卤化铝。对于带有N-羟基或乙酰基取代基的苯并三唑,当在AlI 3和
乙酸酐存在下进行时,会发生脱氮裂解,得到2'-
碘乙酰苯胺作为产物。AlI 3对苯并
三嗪酮的类似裂解提供了2-
碘苯甲酰胺或1-
菲啶酮。相反,用 AlCl 3处理 1-乙酰基苯并三唑和 1,2,3-苯并三酮分别提供苯并三唑和
喹唑啉酮。相反,1-磺酰基苯并三唑更倾向于进行N-去磺酰基化。AlI 3对典型的芳族磺酰胺不反应,使 1-磺酰化苯并三唑的脱保护具有
化学选择性。