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New bitter saponins from the bark of Colubrina elliptica: 1H and 13C assignments by 2D NMR spectroscopy

✍ Scribed by Winston F. Tinto; William F. Reynolds; Compton E. Seaforth; Shaliza Mohammed; Anderson Maxwell

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
362 KB
Volume
31
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Three new bitter saponins, designated mabioside A, B and C, were isolated from the bark of Colubrina elliptica and were determined to be 3‐O‐[α‐JL‐rhamnopyranosy]‐(1 → 6)‐β‐D‐glucopyranosyl‐15‐O‐[β‐D‐ glucopyranosyl] mabiogenin, 3‐O‐[α‐L‐rhamnopyranosy]‐(1 → 6)‐[β‐D‐glucopyranosyl‐(1 → 2)]‐β‐D‐glucopyranosyl}mabiogenin and 3‐O‐[α‐L‐rhamnopyranosyl‐(1 → 6)‐β‐D‐glucopyranosyl] mabiogenin, respectively. The structures were elucidated by using a combination of 2D NMR techniques (H‐H COSY, H‐H DQF‐COSY, RCT‐COSY, C‐H COSY, FLOCK, NOESY).

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