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A mild and atom-efficient four-component cascade strategy for the construction of biologically relevant 4-hydroxyquinolin-2(1H)-one derivatives

Title: A mild and atom-efficient four-component cascade strategy for the construction of biologically relevant 4-hydroxyquinolin-2(1H)-one derivatives
Authors: Dmitrii A. Grishin; Kseniia I. Sharkovskaia; Ilya G. Kolmakov; Daria A. Ipatova; Rostislav A. Petrov; Nikolai D. Dagaev; Dmitry A. Skvortsov; Maria G. Khrenova; Valeriy V. Andreychev; Sergei A. Evteev; Yan A. Ivanenkov; Roman L. Antipin; Olga А. Dontsova; Elena K. Beloglazkina
Source: Beilstein Journal of Organic Chemistry, Vol 22, Iss 1, Pp 244-256 (2026)
Publisher Information: Beilstein-Institut
Publication Year: 2026
Collection: Directory of Open Access Journals: DOAJ Articles
Subject Terms: antibacterial activity; 4-hydroxyquinolin-2(1h)-one; ʟ-proline catalysis; meldrum’s acid; michael addition; multicomponent reaction; Science; Organic chemistry; QD241-441
Description: A mild and atom-economical four-component cascade reaction has been developed, enabling the efficient and selective synthesis of previously inaccessible 4-hydroxyquinolin-2(1H)-one derivatives. Utilizing readily available 6-halo-4-hydroxyquinolinones, aromatic aldehydes, Meldrum’s acid, and alcohols under ʟ-proline catalysis, the reaction proceeds via in situ formation of arylidene-substituted Meldrum acids followed by sequential Michael-type addition and subsequent cascade transformations. This versatile one-pot protocol delivers structurally diverse open-chain 3-arylpropanoate esters in moderate to good yields (46–69%), while cyclic pyranoquinolinones are formed under kinetically controlled conditions. Subsequent transformations afford isopropyl and cyclohexyl analogues via hydrolysis–esterification. A preliminary biological evaluation revealed low cytotoxicity and modest antibacterial activity against Escherichia coli ΔtolC strains. This sustainable synthetic approach constitutes the first direct access to scarcely explored open-chain quinolinone esters, expanding the medicinal chemistry toolbox with promising scaffolds for drug discovery.
Document Type: article in journal/newspaper
Language: English
Relation: https://doi.org/10.3762/bjoc.22.18; https://doaj.org/toc/1860-5397; https://doaj.org/article/4fbddca0eb7d468d934bc9d645b55fcd
DOI: 10.3762/bjoc.22.18
Availability: https://doi.org/10.3762/bjoc.22.18; https://doaj.org/article/4fbddca0eb7d468d934bc9d645b55fcd
Accession Number: edsbas.4E2D1BCC
Database: BASE