Beilstein J. Org. Chem.2025,21, 556–563, doi:10.3762/bjoc.21.44
Constantine V. Milyutin Andrey N. Komogortsev Boris V. Lichitsky N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Pr., 47, Moscow, 119991, Russian Federation 10.3762/bjoc.21.44 Abstract For the first time, the reaction of substituted 2H-furo[3,2-b]pyran-2-ones
unambiguously confirmed by X-ray diffraction.
Keywords: allomaltol; enamines; 2H-furo[3,2-b]pyran-2-ones; pyrazol-3-ones; recyclization; Introduction
Substituted furan-2(5H)-ones (butenolides) are widely used as precursors for the preparation of diverse types of heterocyclic compounds possessing various
communication we investigated the interaction of substituted 2H-furo[3,2-b]pyran-2-ones 1 with nitrogen-containing nucleophiles (Scheme 1b, this work). As a result, the general approach to preparation of pyrazolones with a 3-hydroxy-4-pyranone unit was developed. It’s important to underline that both pyrazolone
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Graphical Abstract
Scheme 1:
Various examples of transformations of furanones.