通过2-苯甲酰基-1H-苯并咪唑与4-硝基-和4-甲氧基苯甲酰基肼的环缩合反应,获得了2-(3,5-二芳基-1H-吡唑-4-基)-1H-苯并咪唑。讨论了所得产物的反应机理和异构现象。根据1 H NMR光谱的数据,稳定化的异构体是其中吸电子芳基取代基位于吡唑环的3位且给电子取代基在吡唑环的5位的异构体。
Synthesis and isomerism of 2-(3,5-diaryl-1H-pyrazol-4-yl)-1H-benzimidazoles
作者:I. B. Dzvinchuk、A. V. Turov、M. O. Lozinskii
DOI:10.1007/s10593-010-0429-x
日期:2009.11
2-(3,5-Diaryl-1H-pyrazol-4-yl)-1H-benzimidazoles have been obtained by the cyclocondensation of 2-phenacyl-1H-benzimidazoles with 4-nitro- and 4-methoxybenzoylhydrazines. The reaction mechanism and the isomerism of the obtained products are discussed. According to the data of 1H NMR spectroscopy the stabilized isomer is that in which the electron-withdrawing aryl substituent is located in position
通过2-苯甲酰基-1H-苯并咪唑与4-硝基-和4-甲氧基苯甲酰基肼的环缩合反应,获得了2-(3,5-二芳基-1H-吡唑-4-基)-1H-苯并咪唑。讨论了所得产物的反应机理和异构现象。根据1 H NMR光谱的数据,稳定化的异构体是其中吸电子芳基取代基位于吡唑环的3位且给电子取代基在吡唑环的5位的异构体。