Synthesis of 3,4-diaryl-5-carboxy-4,5-dihydroisoxazole 2-oxides as valuable synthons for anticancer molecules
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.tet.2017.10.016
日期:2017.11
The convenient regioselective scalable synthesis of 3,4-diaryl-5-carboxy-4,5-dihydroisoxazole 2-oxides was developed based on a condensation of simple starting materials (arylbenzaldehydes, arylnitromethanes, and ethoxycarbonylmethylpyridinium bromide) under mild conditions. The obtained synthons can be applied for the synthesis of 3,4-diarylisoxazole derivatives capable of suppressing malignant growth
Effective Synthesis of 3,4-Diaryl-isoxazole-5-carboxamides and their Antiproliferative Properties
作者:Anna S. Maksimenko、Victor P. Kislyi、Natalia B. Chernysheva、Yuri A. Strelenko、Yan V. Zubavichus、Victor N. Khrustalev、Marina N. Semenova、Victor V. Semenov
DOI:10.1002/ejoc.201900643
日期:2019.7.14
3,4‐Diaryl‐isoxazole‐5‐carboxamides 6, structural analogues of heat shock protein inhibitors, were obtained by a simple scalable rearrangement of intermediate 3,4‐diaryl‐5‐carboxamido‐isoxazoline N‐oxides 5. In contrast, base‐catalyzed recyclization of 3,4‐diaryl‐5‐(ethoxycarbonyl)isoxazoline N‐oxides 9 unexpectedly yielded 5‐hydroxy‐1,2‐oxazin‐6‐ones 17.
We have developed a regioselective synthesis of 3,4-disubstituted isoxazoles by using a chalcone-rearrangement strategy. The reaction of β-ketoacetals with hydroxylamine hydrochloride and pyridine afforded the corresponding 3,4-disubstituted isoxazoles via isoxazolines or oximes. Depending on the substrate, another disubstituted isomer was also obtained under our optimized conditions, and a reaction