One-Pot Synthesis of Densely Substituted Pyrazolo[3,4-<i>b</i>]-4,7-dihydropyridines
作者:H. Surya Prakash Rao、Lakshmi Narayana Adigopula、Krishna Ramadas
DOI:10.1021/acscombsci.6b00156
日期:2017.5.8
We have achieved a facile synthesis of a combinatorial library of densely substituted pyrazolo[3,4-b]-4,7-dihydropyridines— the mimics of antigenital wart drug podophyllotoxin—from 5-aminopyrazoles and 4-(methylthio) 4H-chromenes. The C(4) pyrazolyl 4H-chromenes, which also possess structural features of podophyllotoxin, were isolable intermediates in the two-step, one-pot condensation. The condensation
我们已经实现了密集的取代的吡唑并[3,4的组合文库的简便合成b ] -4,7- dihydropyridines- antigenital疣药物鬼臼毒素从5-氨基吡唑和4-(甲硫基)4的模拟物ħ -chromenes 。C(4)吡唑基4 H-色酮,也具有鬼臼毒素的结构特征,是两步一锅缩合反应中的可分离中间体。当将3-氧代-3-苯基丙腈,肼(5-氨基吡唑的前体)和4-(甲硫基)-4 H-色烯在回流的乙醇中加热时,缩合反应以单锅,多组分的方式进行。但是,冷凝在4 H处停止-甲基chrome阶段,其中使用甲基肼或苯肼。我们的发现为鬼臼毒素模拟物的组合文库的合成提供了机会,从而为发现潜在的癌症治疗候选药物铺平了道路。