Synthesis of new substituted pyrazolo[1,5-a]-pyrimidines and pyrazolo[1,5-a]1,3,5-triazines
作者:W. Ried、S. Aboul-Fetouh
DOI:10.1016/s0040-4020(01)86083-x
日期:1988.1
react with appropriate biselectrophilic reagents in the presence of (TEA) to give the substitution products pyrazolo[1,5-a]pyrimidines 4a-d, 6a-d and pyrazolo[1,5-a ]1,3,5-triazines 8a-d. Compounds 6a and 8a react with secondary amines to 10a-c and 11a-c. Treatment of 2a with malonodinitrile results in the substituted pyrazolo-[1,5-a]pyrimidine 16. Condensation of 2a, 2c and 2d with ethyli-dene-malodintriles
5-取代的3-氨基-1H-吡唑-4-腈2a-d在(TEA)存在下与适当的双亲电子试剂反应,得到取代产物吡唑并[1,5-a]嘧啶4a-d,6a-d和吡唑并[1,5-a] 1,3,5-三嗪8a-d。化合物6a和8a与仲胺反应生成10a-c和11a-c。用丙二腈处理2a导致取代的吡唑并-[1,5-a]嘧啶16。2a,2c和2d的凝结与乙基-二烯-丙二腈一起生成外消旋的二氢-吡唑并[1,5-a]吡啶亚胺18a-e。二烯20与异二烯键体21的反应导致形成Diels-Alder加合物22。