Regioselective synthesis of 3,4-diaryl-5-unsubstituted isoxazoles, analogues of natural cytostatic combretastatin A4
作者:Natalia B. Chernysheva、Anna S. Maksimenko、Fedor A. Andreyanov、Victor P. Kislyi、Yuri A. Strelenko、Victor N. Khrustalev、Marina N. Semenova、Victor V. Semenov
DOI:10.1016/j.ejmech.2018.01.070
日期:2018.2
ted isoxazoles are hardly accessible. The synthesis of 3,4-diaryl-5-unsubstituted isoxazoles 13 was designed based on a condensation of arylbenzaldehydes, arylnitromethanes, and ethoxycarbonylmethylpyridinium bromide followed by a selective one-step transformation of intermediate 3,4-diaryl-5-ethoxycarbonyl-4,5-dihydroisoxazole 2-oxides 8. The orientation of aryl rings in relation to isoxazole heterocycle
4,5-二芳基异恶唑是有效的抗增殖微管蛋白靶向剂。它们的异构体3,4-二芳基-5-未取代的异恶唑很难获得。基于芳基苯甲醛,芳基硝基甲烷和溴乙氧基羰基甲基吡啶的缩合反应,然后选择性地一步转化中间体3,4-二芳基-5-乙氧基羰基-4,设计了3,4-二芳基-5-未取代的异恶唑13的合成, 5-二氢异恶唑2-氧化物8。通过X射线晶体学证实了芳基环相对于异恶唑杂环的取向。使用表型海胆胚胎测定法评估目标化合物的抗有丝分裂微管去稳定活性。3-(4-甲氧基苯基)-4-(3,4,5-三甲氧基苯基)异恶唑13e和具有单个甲氧基取代基的13h最有效。对于0.023μM的NCI-H522人肺癌细胞系,化合物13e在GI 50的NCI60筛选中显示出强大的细胞毒性。