Synthesis and Antifungal <i>in Vitro</i> Evaluation of Pyrazolo[3,4-<i>b</i>]pyridines Derivatives Obtained by Aza-Diels–Alder Reaction and Microwave Irradiation
作者:Jairo Quiroga、Yazmín Villarreal、Jaime Gálvez、Alejandro Ortíz、Braulio Insuasty、Rodrigo Abonia、Marcela Raimondi、Susana Zacchino
DOI:10.1248/cpb.c16-00652
日期:——
A series of pyrazolo[3,4-b]pyridines were prepared by a microwave-assisted aza-Diels-Alder reaction between pyrazolylformimidamides 1 and beta-nitrostyrenes 2 in toluene as the solvent. This procedure provides a simple one-step and environmentally friendly methodology with good yields for the synthesis of these compounds. All compounds were tested for antifungal activity against two clinically important
一系列吡唑并[3,4-b]吡啶是通过在甲苯为溶剂的吡唑基甲亚胺化物1和β-硝基苯乙烯2之间进行微波辅助的aza-Diels-Alder反应制得的。该步骤为合成这些化合物提供了简单的一步式方法,并且对环境友好,并且收率很高。测试所有化合物对两种临床上重要的白色念珠菌和新隐球菌的抗真菌活性。在吡唑环(3a-e)的碳C-3上带有-CH3基团的系列化合物中,对′-苯环(3a)上不带取代基的化合物显示出对两种真菌的最佳活性,其后是p'-Br-苯基(3c)。在吡咯环(3f-j)的碳C-3中带有叔丁基的系列化合物中,未取代的p' -化合物(3f)是最活跃的,其次是(3h)(被p'-Br取代),对两种真菌均表现出最佳的活性。该子系列的其余化合物(3g,i,j)表现出相似的中等活性。发现该系列化合物的抗真菌活性与活性较高的化合物中较高的log P和较低的偶极矩相关。