Ring transformations involving chloroheterocycles. Part III. Reaction of 4-chloroquinazolines with hydrazines
作者:R. A. Bowie、D. A. Thomason
DOI:10.1039/p19720001842
日期:——
gives 4-amino-3-(2-aminophenyl)-4H-1,2,4-triazoles. With 4-chloroquinazoline itself, a second product, 3-(2-aminophenyl)-4H-1,2,4-triazole, is also isolated. The novel 4-amino-4H-1,2,4-triazoles undergo ring closure with triethyl orthoesters to form 5H-1,2,4-triazolo[4,3-d][1,3,4]benzotriazepines, and with aldehydes and ketones to give 6,7-dihydro-5H-1,2,4-triazolo[4,3-d][1,3,4]benzotriazepines. 4-Amin
4- chloroquinazolines与在150℃下在密封管中的水合肼处理,得到4-氨基-3-(2-氨基苯基)-4- ħ -1,2,4-三唑。与4-氯喹唑啉本身,一个第二产品,3-(2-氨基苯基)-4- ħ -1,2,4-三唑,也是分离的。新型的4-氨基-4 H -1,2,4-三唑与三乙基原酸酯进行闭环反应,形成5 H -1,2,4-三唑并[4,3- d ] [1,3,4]苯并三氮杂,,并与醛和酮一起得到6,7-二氢-5 H -1,2,4-三唑并[4,3- d ] [1,3,4]苯并三氮杂s。已显示4-氨基-3-(2-氨基苯基)-4 H -1,2,4-三唑可产生3-(2-叠氮苯基)-4 H-1,2,4-三唑与一当量的亚硝酸和1,2,4-三唑-[4,3- c ] [1,2,3]苯并三嗪与两当量的亚硝酸。用取代的肼处理4-氯喹唑啉产生1,3-二取代的1 H -1,2,4-三唑。建议了这些重新排列的机制。