ISSN:
0170-2041
Keywords:
Mitraria coccinea
;
Gesneriaceae
;
Labdane glycosides, bitter
;
Mitrariosides A - D
;
Carbohydrates
;
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
From Mitraria coccinea Cav. (Gesneriaceae), five strongly bitter labdane glycosides named mitrariosides A1, A2, B, C and D (1 - 5) were obtained. The structures were deduced by chemical and spectroscopic evidence (COSY, 13C-1H CORR, NOESY and MS-FAB) and found to be: mitrarioside A1 (1): (6S)-19-(β-D-galactopyranosyloxy)-6-hydroxy-15-(α-Lrhamno-pyranosyloxy)labda-8(17),13-diene, mitrarioside A2 (2): (6S)-19-(β-D-glucopyranosyloxy)-6-hydroxy-15-(α-L-rhamnopyranosyloxy)labda-8(17),13-diene, mitrarioside B (3):(6S)-19-(β-D-glucopyranosyloxy)-6-hydroxy-15-(β-D-glucopyranosyloxy)-labda-8(17),13-diene, mitrarioside C (4): (6S)-19-(β-D-glucopyranosyloxy)-6,15-dihydroxylabda-8(17), 13-diene, and mitrarioside D (5): (6S)-19-(α-L-rhamnopyranosyloxy)-6,15-dihydroxy-labda-8(17),13-diene. The known compounds acteoside and calceolarioside C were also isolated.
Additional Material:
1 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jlac.1992199201113
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