Synthesis of 5-amino-1H-pyrazolo[4,3-b]pyridine derivatives and annulation of imidazole and pyrimidine rings thereto
作者:Georgiy G. Yakovenko、Oleh А. Lukianov、Marta S. Yagodkina-Yakovenko、Andriy V. Bol’but、Mikhailo V. Vovk
DOI:10.1007/s10593-020-02666-9
日期:2020.3
5-amino-1H-pyrazolo[4,3-b]pyridine nitriles and amides, respectively. Cyclocondensation of the obtained derivatives with chloroacetaldehyde, bromotrifluoroacetone, or ethyl bromopyruvate leads to the formation of imidazo[1,2-a]pyrazolo[3,4-e]pyridines or to pyrazolo[3′,4′,5,6]pyrido[2,3-d]pyrimidine derivatives in cyclocondensation with orthoesters, ethyl oxalyl chloride, or carbonyldiimidazole.
1-烷基-N -Boc -5-甲酰基吡唑-4-胺与丙二腈和氰基乙酰胺反应,分别形成5-氨基-1 H-吡唑并[4,3- b ]吡啶腈和酰胺。所得衍生物与氯乙醛,溴三氟丙酮或溴丙酮酸乙酯的环缩合导致咪唑并[1,2- a ]吡唑并[3,4- e ]吡啶或吡唑并[3',4',5,6]吡啶[2,3- d ]嘧啶衍生物与原酸酯,乙基草酰氯或羰基二咪唑的环缩合反应。