A new flavonol glucoside, the quercetin-3--(2-O--D-glucopiranosil)-D-glucofuranoside, has been isolated from the leaves of Vestia Lycioides together with theisoquercitrin. By the NMR spectrum of the corresponding acetate the -furanosydic structure of the glucose bound to quercetin has been determined.
From the stem bark of Strychnos Romeu Belenii Krukoff & Barneby a Loganiacea of South America, a new indolinic alkaloid has been isolated, to which the structure of 11-methoxydiaboline(I) has been assigned on the basis of u.v., i.r., n.m.r., o.r.d. and MS data. The structure has been confirmed by converting I in -colubrine(II) through the N-deacetylderivative(III) (11-methoxy-Wieland-Gumlich aldehyde), and by acetylation to isocondensamine isomer of condensamine(X). 11-methoxy-Wieland-Gumlich...
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