Studies on the Constituents of the Seeds of Cassia obtusifolia L. The Structures of Two Naphthopyrone Glycosides
Two new naphthopyrones, cassiasides B (1) and C (2), were isolated from the seeds of Cassia obtusifolia L. along with rubrofusarin 6-O-gentiobioside.The structures of the two new compounds 1 and 2 were established as rubrofusarin 6-O-β-D-apiofuranosyl-(1->6)-O-β-D-glucopyranoside and toralactone 9-O-β-gentiobioside, respectively, on the basis of spectral and chemical evidence.Keywords - Cassia obtusifolia; Leguminosae; naphthopyrone glycoside; cassiaside B; cassiaside C
Kitanaka, Susumu,Takido, Michio
p. 3980 - 3984
(2007/10/02)
Biomimetic Syntheses of the Polyketide Fungal Metabolites Alternariol and Rubrofusarin: Models for Cyclisation Reactions Catalysed by Polyketide Synthase Enzymes
Various phenolic polyketone derivatives containing thioester groups, closely analogous in structure to proposed thioester intermediates bound to polyketide synthase enzymes, undergo highly regioselective biomimetic cyclisations to form one or the other of the heptaketide metabolites, rubrofusarin and alternariol methyl ether.
Abell, Chris,Bush, Brian D.,Staunton, James
p. 15 - 17
(2007/10/02)
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