Results 31 to 40 of about 4,839 (215)
Access to highly substituted oxazoles by the reaction of α-azidochalcone with potassium thiocyanate
Beilstein Journal of Organic Chemistry, 2020 The reactivity of α-azidochalcones has been explored for the preparation of highly substituted oxazoles via a 2H-azirine intermediate. The azidochalcones, when treated with potassium thiocyanate in the presence of potassium persulfate, lead to 2,4,5 ...
Mysore Bhyrappa Harisha +4 more
doaj +1 more source
Enantiomeric Separation of New Chiral Azole Compounds
Molecules, 2021 Twelve new azole compounds were synthesized through an ene reaction involving methylidene heterocycles and phenylmaleimide, producing four oxazoles, five thiazoles, and one pyridine derivative, and ethyl glyoxylate for an oxazole and a thiazole compound.
Marziyeh E. Kenari +9 more
doaj +1 more source
Monosubstituted Oxazoles. 1. Synthesis of 5-Substituted Oxazoles by Directed Alkylation
, 2016 A general method is presented for synthesis of 2-(methylthio)-5-substituted oxazoles 2. Deprotonation of the readily available 2-(methylthio)oxazole (1) with n-BuLi occurs smoothly in the presence of TMEDA and regiospecifically at C5.
Tadeusz F. Molinski (1313355) +1 more
core +2 more sources
Proceedings, 2019 Six 1,3-oxazoles were synthetized in moderate to good yields by Van Leusen reaction in a pressure reactor. The methodology allowed to decrease the reaction times reported in the literature from hours to 20 min.
Verónica G. García-Ramírez +4 more
doaj +1 more source
Pyridine C─N Transposition via Cycloaddition–Cycloreversion
Angewandte Chemie, EarlyView.Transposition of pyridine nitrogen from the 4‐ to the 3‐position is described using two open and shut sequences: a nucleophile addition ring‐open ring‐closure, followed by a nitrile Diels–Alder cycloaddition cycloreversion. The nitrogen swap is particularly effective for tertiary alkyl substituents, transforming easily accessible para‐alkylated ...
Aífe Conboy, Michael F. Greaney
wiley +2 more sources
Diazocarbonyl and Related Compounds in the Synthesis of Azoles
Molecules, 2021 Diazocarbonyl compounds have found numerous applications in many areas of chemistry. Among the most developed fields of diazo chemistry is the preparation of azoles from diazo compounds.
Anton Budeev +3 more
doaj +1 more source
Gold Catalyzed Multicomponent Reactions beyond A3 Coupling
Molecules, 2018 The preparation of complex architectures has inspired the search for new methods and new processes in organic synthesis. Multicomponent reactions have become an interesting approach to achieve such molecular diversity and complexity.
Renso Visbal +3 more
doaj +1 more source
, 1980 Oxazoles are prepared from the ketoximes in a single pot ...
Bhatt, MV, Reddy, Gaddam Subba
core +2 more sources
Molecules, 2022 An efficient, versatile, and one-pot method for the preparation of novel fluorinated thiazolo- and oxazolo[3,2-a]pyrimidin-7-ones is described from 2-aminothiazoles or 2-amino-oxazoles and fluorinated alkynoates.
Wafa Blancou +4 more
doaj +1 more source
1,4- Addition of diazomethane to a heterodiene: a direct preparation of the oxazolic ring
Anais da Academia Brasileira de Ciências, 2007 The reaction of naphthoquinone-oximes (3) and (4) with diazomethane yields directly, in one step, the oxazoles (5) and (6), respectively.A reação das naphthoquinona-oximas (3) e (4) com diazometano fornece diretamente, em uma etapa, os oxazóis (5) e (6),
Flávio da S. Emery +9 more
doaj +1 more source