Reaction of 5-aminopyrazole derivatives with ethoxymethylene-malononitrile and its analogues
作者:Katsuhiko Nagahara、Hiroko Kawano、Shinji Sasaoka、Chisa Ukawa、Tamaki Hirama、Atsushi Takada、Howard B. Cottam、Roland K. Robins
DOI:10.1002/jhet.5570310140
日期:1994.1
5-aminopyrazole derivatives 1 with ethoxymethylenemalononitrile (EMMN), ethyl ethoxymethylenecyanoacetate (EMCA) or diethyl ethoxymethylenemalonate (DEMM) gave pyrazolo-[1,5-a]pyrimidine compounds 2,4,8. Also, the one step reaction of EMCA with hydrazine hydrate afforded ethyl(4-ethoxycarbonyl-5-pyrazolyl)aminomethylenecyanoacetate 3c. On the other hand, the reaction of 1-substituted 5-aminopyrazole-4-carboxamide
一锅合成使用5-氨基吡唑衍生物1与乙氧基亚甲基丙二腈(EMMN),乙氧基亚甲基氰基乙酸乙酯(EMCA)或乙氧基亚甲基丙二酸二乙酯(DEMM)得到吡唑并-[1,5- a ]嘧啶化合物2,4,8。同样,EMCA与水合肼的一步反应得到(4-乙氧基羰基-5-吡唑基)氨基亚甲基氰基乙酸乙酯3c。另一方面,1-取代的5-氨基吡唑-4-羧酰胺9与EMMN的反应提供了吡唑并[3,4- d ]嘧啶化合物10。