An efficient synthesis of new caffeine-based chalcones, pyrazolines and pyrazolo[3,4-b][1,4]diazepines as potential antimalarial, antitrypanosomal and antileishmanial agents
作者:Braulio Insuasty、Juan Ramírez、Diana Becerra、Carlos Echeverry、Jairo Quiroga、Rodrigo Abonia、Sara M. Robledo、Iván Darío Vélez、Yulieth Upegui、July A. Muñoz、Victoria Ospina、Manuel Nogueras、Justo Cobo
DOI:10.1016/j.ejmech.2015.02.040
日期:2015.3
A new series of chalcones 5a–f were synthesized from caffeine-based aldehyde 3 and substituted acetophenones 4a–f. Treatment of compounds 5a–f with hydrazine hydrate led to pyrazolines 6a–f, and their subsequent reaction with acetic anhydride or formic acid afforded the corresponding N-substituted pyrazolines 7a–f and 8a–f respectively. Additionally, the regioselective cyclocondensation reaction of
由咖啡因基醛3和取代的苯乙酮4a-f合成了一系列新的查耳酮5a -f。用水合肼处理化合物5a-f产生吡唑啉6a-f,随后与乙酸酐或甲酸反应,分别得到相应的N-取代吡唑啉7a-f和8a-f。此外,查尔酮5a–f与4,5-二氨基吡唑9的区域选择性环缩合反应提供了二氮杂衍生物10a–f。上述新化合物的合成是通过简单的方法进行的,该方法包括易于后处理和温和的反应条件。对于获得的化合物,评估了其对恶性疟原虫的体外抗疟活性。其中,当以20μg/ mL的浓度进行测试时,仅吡唑啉6a表现出显着的生长抑制率85.2±5.4%,而二氮杂10a-f显示出显着的生长抑制率,范围为80.3±13.5至94.2±0.2%。化合物5b,5e,7c和7f在20μg/ mL浓度下,对巴拿马利什曼原虫表现出显着的抑制活性,分别为88.3±1.5、82.6±2.2、82.8±1.7和87.6±0.5%。针对克氏锥虫的体外试验表明,吡唑啉6d在20μg/