63. Isolierung und Struktur von Pteridinen (Lumazinen) aus Russula sp. (Taeublinge; Basidiomycetes)

Article abstract of DOI:10.1002/hlca.19840670223

Extensive chromatographic separations and chemical and spectroscopic investigations have led to the isolation and identification of several water-soluble pteridines from Russula sp., the so-called russupteridines, namely: 1-(5-amino-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)amino-1-deoxy-D-ribitol (1; a pro-lumazine; first identification in a basidiomycete); 1-deoxy-1-(6-methyl-2,4,7-trioxo-1,2,3,4,7,8-hexahydropteridin-8-yl)-D-ribitol (3) and 1-deoxy-1-(2,4,7-trioxo-1,2,3,4,7,8-hexahydropteridin-8-yl)-D-ribitol (4); both compounds found for the first time in higher fungi; they belong to the components with the strongest violet-blue fluorescence in Russula sp.; riboflavine (6; now recognized as an important yellow colorant in a great many of Russula sp.); russupteridine-yellow 1 ( = 1-(6-amino-7-(N-formylimino)-2,4-dioxo-1,2,3,4,7,8-hexahydropteridin-8-yl)-1-deoxy-D-ribitol; 5; a component with very strong fluorescence; the first derivative of the novel 6,7-diamino-lumazine); russupteridine-yellow IV ( = 1-deoxy-1-(2,6,8-trioxo-2,4,5,6,7,8-hexahydro-1H-imidazolo<4,5-g>pteridin-4-yl)-D-ribitol (7).Two further yellow russupteridines (yellow II and yellow V) with very strong fluorescence have been isolated and characterized.