| | 1 | Author
| KarinM. Valant-Vetscheraa, Eckhard Wollenweberb | Requires cookie* | | | Title
| Flavonoid Aglycones from the Leaf Surfaces of Some Artemisia spp. (Com positae-Anthem ideae)  | | | | Abstract
| Several species of the large genus Artemisia have been analysed for the flavonoid aglycone composition of their leaf exudates. These species belong to different taxonomic groups within Artemisia. Flavone and flavonol aglycones were found as the major flavonoid constituents of the leaf exudates. Many of these compounds were 6-methoxylated, with additional substitu tions at the 7-, 3'-and 4'-position of the molecule. In addition, 7,4'-substituted apigenin and luteolin derivatives and rarely also coumarin derivatives were encountered in some species. The observed substitution trends are in accordance with literature data. Taxonomic and eco logical aspects are briefly discussed. | | | |
Reference
| Z. Naturforsch. 50c, 353—357 (1995); received January 23/February 27 1995 | | | |
Published
| 1995 | | | |
Keywords
| Artemisia, Compositae-Anthemideae, Leaf Exudates, Flavones, Coumarins | | | |
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| default:Reihe_C/50/ZNC-1995-50c-0353.pdf | | | | Identifier
| ZNC-1995-50c-0353 | | | | Volume
| 50 | |
| 2 | Author
| Fiirstner, DenisN. Jumbam, Nongyuan Shi | Requires cookie* | | | Title
| Alois | | | | Abstract
| Low-valent titanium prepared by the reduction of TiCl3 with zinc dust oxidatively adds to a-ketoam ides or a-ketoesters with the formation of the corresponding titanium enediolates. These 1,2-difunctional nucleophiles, which have hardly been used in organic synthesis so far, undergo regioselective intramolecular aldol condensation reactions with various electrophiles such as aldehydes, ketones, nitriles, esters and amides. This methodology allows the synthesis of differently substituted coumarin and 2-quinolone derivatives. | | | |
Reference
| Z. Naturforsch. 50b, 326—332 (1995); received September 13 1994 | | | |
Published
| 1995 | | | |
Keywords
| Low-Valent Titanium, Enediolates, Coumarins, 2-Quinolones, Aldol Condensation | | | |
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| default:Reihe_B/50/ZNB-1995-50b-0326.pdf | | | | Identifier
| ZNB-1995-50b-0326 | | | | Volume
| 50 | |
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