Green metal-free synthesis of spiro-fused 3,4′-pyrazolo[4′,3′:5,6]pyrido[2,3-d]pyrimidine derivatives via deamination cyclization reactions in aqueous medium
作者:Lei Dai、Kaimin Mao、Zhengbing Pan、Liangce Rong
DOI:10.1007/s11164-018-3642-3
日期:2019.2
metal-free synthesis of spiro-fused 3,4′-pyrazolo[4′,3′:5,6]pyrido[2,3- d ]pyrimidine derivatives via deamination cyclization reactions of isatins, substituted 1 H -pyrazol-5-amine, and 6-aminopyrimidine-2,4(1 H ,3 H )-dione or 6-amino-1,3-dimethylpyrimidine-2,4(1 H ,3 H )-dione in aqueous medium is reported. This is an efficient route for synthesis of the target products by deamination cyclization
通过取代的1 H- 吡唑-的靛红的脱氨基环化反应,绿色合成无螺旋合成的3,4'-吡唑并[4',3':5,6]吡啶[2,3- d ]嘧啶衍生物 据报道在水性介质中有5-胺和6-氨基嘧啶-2,4(1 H ,3 H )-二酮或6-氨基-1,3-二甲基嘧啶-2,4(1 H ,3 H )-二酮。这是通过脱氨基环化反应合成目标产物的有效途径。该方法的其他优点是产量高,易于分离,基材范围广和环境友好。