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Synthesis of (±) cis 6a,12a-dihydro-6H,7H-[1]-benzopyrano-[4,3-b]-[1]-benzopyran

✍ Scribed by Paolo Da Re; Piero Valenti; Lamberto Cateni; Pier Luigi Barili

Book ID
104212916
Publisher
Elsevier Science
Year
1976
Tongue
French
Weight
113 KB
Volume
17
Category
Article
ISSN
0040-4039

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✦ Synopsis

Homoisoflavones (3-benzylchromones) constitute a new class of natural compounds which were not known until very recently (Tamm, 1972). They appear to be present in some members of the family of Liliaceae, having been eo far isolated from different species of Eucomis' and from Scilla scilloides2.

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New chromonocoumarin (=6H, 7H-[1]Benzopy
New chromonocoumarin (=6H, 7H-[1]Benzopyrano[4,3-b][1]benzopyran-6,7-dione) derivatives from Polygala fruticosa BERG
✍ Ermindo R. Di Paolo; Matthias O. Hamburger; Helen Stoeckli-Evans; Colin Rogers; 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 German ⚖ 532 KB

Three chromonocoumarins ( = 6H,7H- [ l]benzopyrano [4.3-6][ l]benzopyran-6,7-diones) 1-3 have been isolated from the leaves and the root bark of Polygala fruticosa BERG. (syn. Polygala oppositifolia L.; Polygalaceae). The structure of frutinone A (1) was established by X-ray diffraction analysis. Th