Thermal Rearrangement of Allyl Substituted Unsymmetric 4H-1,2,4-Triazoles to the Corresponding 1H-1,2,4-triazoles
作者:Kåre Jørgensen、Ragnhild Olsen、Per Carlsen
DOI:10.3390/60500481
日期:——
A series of neat 4-(2-alkenyl) substituted 5-methyl-3-phenyl-4H-1,2,4-triazoles were thermolyzed at 320 °C producing a rearrangement products, of which the regioisomeric 1- and 2-substituted triazoles were the main products. The group migrations were rationalized in terms of consecutive SN2-type reactions. This mechanism was supported by a study of the alkylations of the triazoles which gave similar
一系列纯 4-(2-烯基) 取代的 5-甲基-3-苯基-4H-1,2,4-三唑在 320°C 下热解产生重排产物,其中区域异构体 1-和 2-取代三唑类是主要产品。就连续的 SN2 型反应而言,组迁移被合理化。这种机制得到了三唑烷基化研究的支持,该研究产生了类似的产物混合物。另一方面,4-(2-烯基)取代的3-苯基-4H-1,2,4-三唑主要产生消除产物。