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Synthesis of pyridine oxides and isoxazolines from 4-(2-oxoalkylidene)-pyrans

✍ Scribed by Crabb�, Pierre; Haro, Jorge; Rius, Carlos; Santos, Elvira

Book ID
120821790
Publisher
Royal Society of Chemistry
Year
1975
Weight
725 KB
Volume
14
Category
Article
ISSN
1472-7781

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Reaction of pyrylium salts with nucleoph
Reaction of pyrylium salts with nucleophiles. Part 25. Formation of pyridine-1-oxides, 2-isoxazolines and 1-pyrazoline-1-oxides
✍ Cornelia Uncuta; Miron Teodor Cǎproiu; Valentin Câmpeanu; Aurica Petride; Marian 📂 Article 📅 1998 🏛 Elsevier Science 🌐 French ⚖ 989 KB

The reaction of tri-and tetrasubstituted pyrylium salts with hydroxylamine affords acyclic keto-ketoximes (to be described in a separate paper) which cyclize yielding pyridine-l-oxides and/or 2-isoxazolines. Both these classes of compounds, with many possible applications, can thus be obtained simpl