8-Amino-3-benzyl-1,2,4-triazolo[4,3-a]pyrazines. Synthesis and anticonvulsant activity.
作者:James L. Kelley、James A. Linn、Donald D. Bankston、Christopher J. Burchall、Francis E. Soroko、Barrett R. Cooper
DOI:10.1021/jm00018a029
日期:1995.9
4-triazolo[4,3-a] pyrazines were synthesized and tested for anticonvulsant activity against maximal electroshock-induced seizures (MES) in rats. The compounds were prepared in four stages from the phenylacetonitriles. I. The intermediate (2,2,2-triethoxyethyl)benzenes III were condensed with 2-chloro-3-hydrazinopyrazine (IV) to provide the 3-benzyl-8-chloro-1,2,4-triazolo[4,3-a]pyrazines V. The latter
合成了11个取代的8-氨基-3-苄基-1,2,4-三唑并[4,3-a]吡嗪,并测试了其对大鼠最大电击诱发癫痫发作(MES)的抗惊厥活性。由苯基乙腈分四个阶段制备化合物。I.将中间体(2,2,2-三乙氧基乙基)苯III与2-氯-3-肼基吡嗪(IV)缩合,得到3-苄基-8-氯-1,2,4-三唑并[4,3 -a]吡嗪V。后者被甲胺或氨转化为8-胺靶VI。几种化合物对MES表现出有效的活性;3-(2-氟苄基)-8-(甲基氨基)和3-(2,6-二氟苄基)-8-(甲基氨基)同源物(4和12)在口服ED50S为3 mg / kg时表现出最佳的抗惊厥活性。1,2,4-三唑[4,3-a]吡嗪环系统用作嘌呤环的生物等排体,具有抗惊厥活性;但是,这些药物引起呕吐的倾向较小。