22621-94-9Relevant academic research and scientific papers
Two chromone-secoiridoid glycosides and three indole alkaloid glycosides from Neonauclea sessilifolia
Itoh, Atsuko,Tanahashi, Takao,Nagakura, Naotaka,Nishi, Toyoyuki
, p. 359 - 369 (2007/10/03)
From the dried roots of Neonauclea sessilifolia, two new chromone-secoiridoid glycosides, sessilifoside and 7″-O-β-D-glucopyranosylsessilifoside, and three novel indole alkaloid glycosides, neonaucleosides A, B, and C, were isolated along with the main known glycosides, 5-hydroxy-2-methylchromone-7-O-β-D-apiofuranosyl-(1→6)- β-D-glucopyranoside, sweroside, loganin, grandifloroside, and quinovic acid 3β-O-β-D-quinovopyranoside-28-O-β-D-glucopyranoside. The structures of these new glycosides were determined by spectroscopic and chemical means. Neonaucleoside A and its C-3 epimer were prepared from secologanin and tryptamine.
Con figurative correlation and conformational analysis of strictosidine and vincoside derivatives
Patthy-Lukats, Agnes,Kocsis, Akos,Szabo, Laszlo F.,Podanyi
, p. 1492 - 1499 (2007/10/03)
On the basis of the configuration of C-15 of the secologanin unit, using detailed NMR analysis, the configuration of C-3, the solution conformation around C-14, and the glucosidic bridge, as well as those of the dihydropyran and tetrahydropyridine rings, were determined in the vincosamide and strictosamide derivatives 4b and 5b. The stereochemical analysis was extended by chemical correlation to the 4-benzylated strictosidine and vincoside derivatives 3c and 3d. Experimental proof was presented for the interpretation of the 'anomalous' chemical shift of acetylated strictosamide derivatives.
