Nitropyrazoles 15. Synthesis and some transformations of 1-(2,4-dinitrophenyl)-4-methyl-3,5-dinitropyrazole
作者:A. A. Zaitsev、I. A. Vatsadze、I. L. Dalinger、V. V. Kachala、Yu. V. Nelyubina、S. A. Shevelev
DOI:10.1007/s11172-009-0288-8
日期:2009.10
The method for preparation of 1-(2,4-dinitrophenyl)-4-methyl-3,5-dinitropyrazole has been developed. Due to the larger CH-acidity of 4-Me-group compared to 1,4-dimethyl-3,5-dinitropyrazole, 1-(2,4-dinitrophenyl)-4-methyl-3,5-dinitropyrazole is capable of reacting with substituted benzaldehydes to afford 4-[(E)-2-arylvinyl]-1-(2,4-dinitrophenyl)-3,5-dinitropyrazoles. Under the action of nucleophiles, dinitrophenyl group is detached from the former compounds leading to previously unknown N-unsubstituted 4-[(E)-2-arylvinyl]-3,5-dinitropyrazoles.
已开发出制备1-(2,4-二硝基苯基)-4-甲基-3,5-二硝基吡唑的方法。由于4-甲基-相对于1,4-二甲基-3,5-二硝基吡唑具有更大的CH酸性,1-(2,4-二硝基苯基)-4-甲基-3,5-二硝基吡唑能够与取代苯甲醛反应,生成4-[(E)-2-芳基乙烯基]-1-(2,4-二硝基苯基)-3,5-二硝基吡唑。在亲核试剂的作用下,二硝基苯基从先前的化合物中脱离,导致之前未知的无N-取代的4-[(E)-2-芳基乙烯基]-3,5-二硝基吡唑的生成。