Unequivocal determination of isomeric products of reaction between 3-methyl-1-phenyl-2-pyrazoline-4,5-dione and aromatic 1,2-diamines
作者:Erkki Kolehmainen、Zdzisław Kucybała、Ryszard Gawinecki、Jerzy Pączkowski、Anna Kacała
DOI:10.1016/s0040-4020(99)00433-0
日期:1999.7
Regioselectivity of condensation of 3-methyl-1-phenyl-2-pyrazoline-4,5-dione with aromatic 1,2-diamines is dependent on substituent present. Isomeric 3-methyl-1-phenyl-1H-pyrazolo-[3,4-b]-quinoxaline products are distinguished by comparison of their 2D z-gradient selected 1H, 15N HMBC (Heteronuclear Multiple Bond Correlation) spectra. Multiplicity of H5 signal, which is recognizable by the cross-peak
3-甲基-1-苯基-2-吡唑啉-4,5-二酮与芳族1,2-二胺的缩合区域选择性取决于存在的取代基。异构体3-甲基-1-苯基-1 H-吡唑并-[3,4- b ]-喹喔啉产物通过比较其2D z-梯度选择的1 H,15 N HMBC(异核多键相关)光谱来区分。H5信号的多重性(对于C H 3(3)-N4和H5-N4相互作用可通过交叉峰识别)表示位置6或7的取代。预期所应用的方法可用于确定其他位置的结构异构体。