522. A New Method for Obtaining Carboxylic Derivatives of Oxazolo[5,4-b]pyridine Based on 3-Aminopyridine-2(1,H)-ones

Irina V. Palamarchuk, Ivan V. Kulakov, Eurasian Journal of Chemistry, (2024), DOI: 10.31489/2959-0663/2-24-11

Current methods for synthesis of oxazolo[5,4-b]- and oxazolo[4,5-b]pyridines have several limitations, such as severe reaction conditions, lengthy reaction times, low yields and concurrent formation of side reaction products. This article presents the results of study focused on a one-step method for the synthesis of new de-rivatives of oxazolo[5,4-b]pyridine incorporating an aliphatic carboxylic group as a linker. During the inves-tigation of acylation reactions of 3-aminopyridine-2(1H)-ones with cyclic anhydrides of dicarboxylic acids (succinic, maleic and glutaric), it was found that the monoamides formed at the initial stage undergo intramo-lecular cyclization yielding derivatives of oxazolo[5,4-b]pyridine. Subsequently, the reaction conditions were studied and optimized to achieve the target compounds with high yield and purity. The potential anti-inflammatory activity of the obtained derivatives of oxazolo[5,4-b]pyridine was evaluated by molecular dock-ing method using AutoDock Vina software. Compounds 11-14b exhibited higher binding affinity with the se-lected target protein Prostaglandin synthase-2 (1CX2) compared to the reference anti-inflammatory drug di-clofenac. Thus, taking into account the results of in silico analyses, the newly synthesized oxazolo[5,4- b]pyridine derivatives based on 3-aminopyridine-2(1H)-ones are promising candidates for further investiga-tion of their potential anti-inflammatory activity through in vivo methods.