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Beilstein J. Org. Chem. 2026, 22, 244–256, doi:10.3762/bjoc.22.18
Graphical Abstract
Figure 1: Examples of biologically active quinolin-2(1H)-ones.
Figure 2: Structures obtained via rational design aimed at enhancing antibacterial activity.
Scheme 1: Previously reported and newly developed 3-(4-hydroxy-2-oxo-1,2-dihydroquinolin-3-yl)-3-arylpropanoi...
Scheme 2: Retrosynthetic analysis: two alternative approaches to target compounds.
Scheme 3: Two-stage synthesis A) and one-stage one-pot synthesis B) of 6-halogen-4-hydroxyquinoline-2(1H)-one...
Scheme 4: Previous synthetic attempts toward the target chemotype using various approaches.
Scheme 5: Four-component synthesis of 3-(6-halo-4-hydroxy-2-oxo-1,2-dihydroquinolin-3-yl)-3-(3,4-dimethoxyphe...
Scheme 6: The proposed mechanism of the four-component reaction.
Scheme 7: Synthesis of isopropyl (12a–c) and cyclohexyl (13а–с) esters of 3-(4-hydroxy-2-oxo-1,2-dihydroquino...
Figure 3: In vitro antibacterial activity studies. А) In vitro antibacterial activity using the E. coli ΔtolC...
Beilstein J. Org. Chem. 2025, 21, 1552–1560, doi:10.3762/bjoc.21.118
Figure 1: Design and synthetic strategies for the target hydantoin/1,2,4-oxadiazoline spiro-compounds.
Scheme 1: Synthesis of dipolarophiles (5-iminohydantoins 2a–i).
Scheme 2: Preparation of the dipole precursors 4a–d.
Scheme 3: 32CA reactions of nitrile oxides with 5-iminohydantoins (synthesis of spiro-compounds 5a–l). Isolat...
Scheme 4: Cycloaddition of nitrile oxide to 5-iminothiohydantoin 2j. aTriethylamine dropwise addition (2.4 eq...
Figure 2: Atropoisomerism of ortho-substituted spiro-compounds 5b and 5d.
Figure 3: Cytotoxicity investigation of hydantoin/1,2,4-oxadiazolines 5 (MTT test, HCT116 cell line) and sele...
Beilstein J. Org. Chem. 2025, 21, 262–269, doi:10.3762/bjoc.21.18
Scheme 1: Knoevenagel and Diels–Alder reactions in the multicomponent synthesis of substituted cyclohexadiene...
Figure 1: Equipment for carrying out reactions by the diffusion mixing method.
Scheme 2: Interaction of diketone 1 with formaldehyde under the diffusion mixing conditions.
Scheme 3: Products of three-component reactions of methylene derivatives, formaldehyde and various dienes.
Scheme 4: Proposed mechanism for the formation of compounds 8 and 9 in the presence of ʟ-proline.
Scheme 5: Interconversion of derivatives 8 and 9.
Scheme 6: Interaction of 4a/4b and 5a/5b mixtures with bromine.