Synthesis of Functionalized 1H-Pyrazolo[4,3-e][1,2,4]triazines and Their Fused Derivatives via Ipso-Substitution of Methylsulfonyl Group with O-, N-, S- and C-Nucleophiles
作者:Andrzej Rykowski、Mariusz Mojzych
DOI:10.3987/com-04-10108
日期:——
reaction of 3-methyl-5-methylsulfonyl-1-phenyl-1H-pyrazolo[4,3-e][1,2,4]triazine (4) with a range of C-, N-, O- and S-nucleophiles afforded the corresponding substitution products (5a-m) in high yields. The reaction of 5-hydrazino compound (5m) with carboxylic acids furnished 1H-pyrazolo[4,3-e]-1,2,4-triazolo[4,3-b][1,2,4]triazines (8a) and (8b).
3-甲基-5-甲基磺酰基-1-苯基-1H-吡唑并[4,3-e][1,2,4]三嗪(4)与一系列C-、N-、O-的同位取代反应和 S- 亲核试剂以高产率提供相应的取代产物 (5a-m)。5-肼基化合物 (5m) 与羧酸反应得到 1H-吡唑并[4,3-e]-1,2,4-三唑并[4,3-b][1,2,4]三嗪 (8a) (8b)。