azide, gives indazolo[3,2-b]benzothiazole by attack on the benzothiazole nitrogen. Similar attack of the nitrene in 2-(2-nitrophenyl)benzimidazoles gives benzimidazoindazoles in good yield. However, with an appropriate 1-substituent in the benzimidazole (e.g. Me or CHMe2) the nitrene in its triplet state (generated by acetophenone-sensitised photolysis or by thermolysis of the azide bearing a 4-dimethylamino-group)
通过相应
硝基化合物的脱氧作用或相关
叠氮化物的热解或光解反应制得的2-(2-
硝基苯基)
苯并噻唑通过攻击
苯并噻唑氮而得到
吲唑并[3,2- b ]
苯并噻唑。在(2-(2-
硝基苯基)
苯并咪唑中,类似的氮原子侵蚀使得
苯并咪唑并
吲唑具有良好的收率。但是,在
苯并咪唑中有适当的1-取代基(例如Me或CHMe 2)时,三重态(通过
苯乙酮敏化的光解作用或带有4-
二甲氨基的
叠氮化物的热分解产生)的腈优先攻击该取代基得到
苯并咪唑并
喹唑啉。