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Preparative routes to spiroacetals derived from chroman-4-one (2,3-dihydro-4H-1-benzopyran-4-one)

✍ Scribed by Peter J. Cremins; Roy Hayes; Timothy W. Wallace

Publisher
Elsevier Science
Year
1993
Tongue
French
Weight
626 KB
Volume
49
Category
Article
ISSN
0040-4020

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✦ Synopsis

Methyl 2-(4-hydroxybutyl)-4-oxo-4~-1-benzopyran-3-carboxylate 6 1s transformed mto the sproacetals 13 and 14 (ratio 5 1) vw treatment with mdomethane&otassmm carbonate, the process mvolvmg sequenaal mtramolecular conjugate addmon and enolate alkylafion The 2,3-epoxlde 7 derived from 6 undergoes spuwychsation to the hydroxyesters 16 and 17 upon treatment with acids The siruchues of 13 and 16 were confirmed by X-ray crystallography

📜 SIMILAR VOLUMES

2,3-Dihydro-7,8-dihydr­oxy-3-[(4-methoxy
2,3-Dihydro-7,8-dihydr­oxy-3-[(4-methoxy­phenyl)methyl­ene]-4H-1-benzopyran-4-one
✍ Chantrapromma, Suchada ;Boonsri, Sompong ;Fun, Hoong-Kun ;Anjum, Shazia ;Kanjana 📂 Article 📅 2006 🏛 International Union of Crystallography 🌐 English ⚖ 241 KB

The title compound, also known as intricatinol, C~17~H~14~O~5~, is a homoisoflavanoid that was isolated for the first time from the twigs and stems of __Caesalpinia digyna__ Rottler. The pyran ring is in an envelope form. O—H...O intramolecular hydrogen bonds are observed. Symmetry-related molecules

Reactions of 2-Amino-4H-1-benzopyran-4-o
Reactions of 2-Amino-4H-1-benzopyran-4-one with 4-Oxo-4H-1-benzopyran-3-carbaldehydes.
✍ Tarun Ghosh; Chandrakanta Bandyopadhyay 📂 Article 📅 2007 🏛 John Wiley and Sons ⚖ 25 KB 👁 1 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Reactions of 2-amino-4h-1-benzopyran-4-o
Reactions of 2-amino-4h-1-benzopyran-4-one with 4-oxo-4h-1-benzopyran-3-carbaldehydes
✍ Tarun Ghosh; Chandrakanta Bandyopadhyay 📂 Article 📅 2006 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 267 KB 👁 1 views

## Abstract magnified image The title aldehyde **1** reacts smoothly with the enamine moiety of **2**‐aminochromone **2** to produce hitherto unreported 3‐(2‐hydroxybenzoyl)‐5__H__‐1‐benzopyrano[2,3‐__b__]pyridin‐5‐one (azaxanthone) **5**. This reaction has been extended for the synthesis of bisaz