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Search for "pyrazol-3-ones" in Full Text gives 3 result(s) in Beilstein Journal of Organic Chemistry.

Study of the interaction of 2H-furo[3,2-b]pyran-2-ones with nitrogen-containing nucleophiles

  • Constantine V. Milyutin,
  • Andrey N. Komogortsev and
  • Boris V. Lichitsky

Beilstein J. Org. Chem. 2025, 21, 556–563, doi:10.3762/bjoc.21.44

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  • , interaction with dinucleophiles results in recyclization accompanied by opening of the furan ring. Relied on the aforementioned process a general method for the synthesis of substituted pyrazol-3-ones with allomaltol fragment was designed. Structures of representatives of all obtained products were
  • 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
  • ). Synthesis of pyrazol-3-ones 8. Reaction conditions: 1 (1 mmol), hydrazine 7 (1.1 mmol), EtOH (5 mL). Synthesis of pyrazol-3-one 10a. Synthesis of unsubstituted pyrazol-3-ones 10. Reaction conditions: 1 (1 mmol), hydrazine hydrate (2 mmol, 0.10 g), AcOH (5 mL). Synthesis of isoxazolone 11. Reaction
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Published 13 Mar 2025

Molecular iodine-catalyzed one-pot multicomponent synthesis of 5-amino-4-(arylselanyl)-1H-pyrazoles

  • Camila S. Pires,
  • Daniela H. de Oliveira,
  • Maria R. B. Pontel,
  • Jean C. Kazmierczak,
  • Roberta Cargnelutti,
  • Diego Alves,
  • Raquel G. Jacob and
  • Ricardo F. Schumacher

Beilstein J. Org. Chem. 2018, 14, 2789–2798, doi:10.3762/bjoc.14.256

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  • ) [8]. Attanasi and co-workers described the synthesis of 4-(phenylseleno)pyrazol-3-ones through α-(phenylseleno)hydrazone reagents under basic conditions [9]. In 2015, Yu and co-workers described one example for the condensation reaction of α-oxo ketene dithioacetal with hydrazine hydrate to produce
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Published 06 Nov 2018

Dialkyl dicyanofumarates and dicyanomaleates as versatile building blocks for synthetic organic chemistry and mechanistic studies

  • Grzegorz Mlostoń and
  • Heinz Heimgartner

Beilstein J. Org. Chem. 2017, 13, 2235–2251, doi:10.3762/bjoc.13.221

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  • , and in both cases pyrazol-3-ones 68 were obtained in ca. 35% yield (Scheme 22). The heterocyclization leading to 68 occurs in the intermediate enehydrazide 69 through the nucleophilic attack of the N-atom onto the ester group. The second product was postulated either as a 2,3-dihydro-1,3,4-oxadiazole
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Published 24 Oct 2017
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