�ber das Vorkommen von Flavonglykosiden inCapsicum-Pflanzen

Rangoonwala, R.; Friedrich, Hans

doi:10.1007/bf00636638

Cited by 14 publications

(1 citation statement)

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“…Investigations on the stereochemistry of the reaction led to the following results: Whereas the addition of diazomethane to the keto sugar (43) leads mainly to the epoxide (44), which can be reduced to the 2-C-methyl compound (45) with the ribo-c~nfiguration~~~] (the reaction follows a complementary course to the reaction with methylmagnesium iodide, in which the arabino-compound (46) is formed'791), the reaction of (47) both with phenylethynylmagnesium bromide and with diazomethane leads mainly to the ribocompound (48)[771.…”

Section: Addition Of Diazomethane To Keto Sugarsmentioning

confidence: 99%

Chemistry and Biochemistry of Branched‐Chain Sugars

Grisebach

Schmid

1972

Angew. Chem. Int. Ed. Engl.

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Section: Addition Of Diazomethane To Keto Sugarsmentioning

confidence: 99%

Chemistry and Biochemistry of Branched‐Chain Sugars

Grisebach

Schmid

1972

Angew. Chem. Int. Ed. Engl.

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Chemie und Biochemie verzweigtkettiger Zucker

Grisebach

Schmid

1972

Angewandte Chemie

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Verzweigtkettige Zucker sind in jüngerer Zeit in größerer Zahl aus Mikroorganismen und höheren Pflanzen als glykosidische Bestandteile von Antibiotika oder phenolischen Verbindungen isoliert worden. In Pflanzen kommen sie auch in Polysacchariden der Zellwand vor. Bisher wurden Zucker mit Methyl‐, Hydroxymethyl‐, Formyl‐, Hydroxyäthyl‐ und Glykoloyl‐Verzweigung in der Natur gefunden. Für die Synthese dieser Zucker wurden zahlreiche neue Verfahren entwickelt. Mit einer Ausnahme lassen sich die bisher bekannten verzweigtkettigen Zucker biogenetisch in drei Gruppen einteilen. Zucker mit Methyl‐Verzweigung entstehen durch C1‐Übertragung, hydroxyäthyl‐verzweigte Zucker durch C2‐Übertragung auf eine Hexosekette und Zucker mit Hydroxymethyl‐ oder Formyl‐Verzweigung durch Umlagerung einer Hexose‐ oder Pentosekette.

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A Chemosystematic Study of Selected Taxa of Capsicum

Ballard

McClure

Eshbaugh

et al. 1970

American J of Botany

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Six taxa of Capsicum were chosen for a comparative chemosystematic study. A “key” individual from each taxon was selected for intensive chemical investigation. Thirteen flavonoids were isolated from leaf material and characterized by paper chromatography and absorption spectroscopy. The C‐glycosylflavones vitexin and isovitexin, and orientin and iso‐orientin, as well as O‐glycosides of the flavones apigenin, luteolin, and chrysoeriol, were isolated from the key individuals. Chromatographic analysis of collections from various regions of South America, Central America, and Mexico showed in general that flavonoid variability is more common in cultivated taxa than in wild. Three groups of Capsicum were recognized and the main systematic conclusions were: (1) The white‐flowered taxa in Group I, C. baccatum var. baccatum and C. baccatum var. pendulum, have identical flavonoids, corroborating previous conclusions that they are one species. The absence of chrysoeriol in this group separates it from Groups II and III. (2) The purple‐to‐white‐flowered C. eximium var. eximium and C. eximium var. lomenlosum, Group II, have a complex flavonoid chemistry which appears to link Groups I and III. (3) Two purple‐flowered species, C. cardenasii and C. pubescens, Group III, are chemically distinct from the other taxa examined.

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�ber das Vorkommen von Flavonglykosiden inCapsicum-Pflanzen

Cited by 14 publications

References 1 publication

Chemistry and Biochemistry of Branched‐Chain Sugars

Chemistry and Biochemistry of Branched‐Chain Sugars

Chemie und Biochemie verzweigtkettiger Zucker

A Chemosystematic Study of Selected Taxa of Capsicum

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