Cycloaddition of aroyl- and acylketene S,N-acetals 1a-l with tosyl azide 2 under alkaline conditions affords novel regiospecifically substituted 4-aroyl/acyl-1-phenyl/alkyl-5-tosylamino-1H-1,2,3-triazoles 5a-1. Some of them (5a-e, g, h) are shown to undergo facile detosylation in the presence of concentrated sulfuric acid to give the corresponding 5-aminotriazoles 6a-e, g, h in excellent yields. The reaction of cyclic S,N-acetals 8a-c with 2 in dioxane at higher temperature yields the corresponding bicyclic 3-aroyl-5,6-dihydrothiazolo[3,2-c] [1,2,3]-triazoles 10a-c in good yields.
在碱性条件下,芳基和酰基
乙烯基 S,N-
乙醛 1a-l 与
甲苯基
叠氮化物 2 环加成,可得到新的区域特异性取代的 4-芳酰基/酰基-1-苯基/烷基-5-
对甲苯磺酸氨基-
1H-1,2,3-三唑 5a-1。研究表明,其中一些(5a-e、g、h)在浓
硫酸存在下容易发生去甲基化反应,从而以极好的收率得到相应的 5-
氨基三唑 6a-e、g、h。环状 S,N-
乙醛 8a-c 与 2 在
二噁烷中于较高温度下反应,可得到相应的双环 3-芳酰基-5,6-二氢
噻唑并[3,2-c] [1,2,3]- 三唑 10a-c,收率很高。