Synthesis and study of the azide-tetrazole tautomerism in 2-azido-4-(trifluoromethyl)-6-R-pyrimidines (R = H, 4-ClC6H4)
作者:Е. B. Nikolaenkova、N. V. Aleksandrova、V. I. Mamatyuk、V. P. Krivopalov
DOI:10.1007/s11172-018-2154-z
日期:2018.5
orophenyl)pyrimidine, only an azide isomer was detected in CDCl3 solution, and in DMSO-d6 solution it is in equilibrium with 5-(trifluoromethyl)-7-(4-chlorophenyl) tetrazolo[1,5-a]pyrimidine (the tautomer ratio is 99 : 1). Thermodynamic and kinetic parameters of 5-trifluoromethyltetrazolo[1,5-a]pyrimidine ⇆ 2-azido-4-trifluoromethylpyri midine tautomeric rearrangement in DMSO-d6 for 5-trifluoromethyltetrazolo[1
以2-叠氮嘧啶为例,研究了带有三氟甲基的叠氮嘧啶中的叠氮-四唑平衡。后者是通过 2-肼基-4-三氟甲基嘧啶的亚硝化和 NaN3 与 4-三氟甲基-2-氯-6-(4-氯苯基)嘧啶的反应合成的。互变异构平衡 5-三氟甲基四唑并[1,5-a]嘧啶⇆ 2-叠氮基-4-三氟甲基嘧啶在无溶剂和DMSO-d6溶液中观察到,而在CDCl3中仅存在叠氮化物形式。对于2-叠氮基-4-三氟甲基-6-(4-氯苯基)嘧啶,在CDCl3溶液中仅检测到叠氮化物异构体,而在DMSO-d6溶液中与5-(三氟甲基)-7-(4-氯苯基)四唑并[1,5-a]嘧啶(互变异构体比例为99:1)。5-三氟甲基四唑的热力学和动力学参数[1,