Cryptobuchanosides A –G: seven previously undescribed triterpene glycosides from Cryptolepis buchananii R.Br. ex Roem. and Schult. with nitric oxide production inhibition activity

In this study, nine triterpene glycosides including seven previously undescribed compounds (1–7), were isolated from leaves ofCryptolepis buchananii R.Br. ex Roem. and Schult. using various chromatographic methods. The chemical structures of the compounds were elucidated to be 3-O- β-d-glucopyranosyl-(1  → 6)-β-d-glucopyranosyluncargenin C 28-O- α-l-rhamnopyranosyl-(1  → 2)-β-d-glucopyranosyl ester (1), 3-O- β-d-glucopyranosyl-(1  → 2)-β-d-glucopyranosyluncargenin C 28-O- α-l-rhamnopyranosyl-(1  → 2)-β-d-glucopyranosyl ester (2), 3-O- β-d-glucopyranosyl-(1  → 2)-β-d-glucopyranosyluncargenin C 28-O- β-d-glucopyranosyl-(1  → 4)-α-l-rhamnopyranosyl-(1  → 2)-β-d-glucopyranosyl ester (3), 3-O- β-d-glucopyranosyl-(1  → 2)-β-d-glucopyranosylhederagenin 28-O- α-l-rhamnopyranosyl-(1  → 2)-β-d-glucopyranosyl ester (4), 3-O- β-d-glucopyranosylarjunolic acid 28-O- α-l-rhamnopyranosyl-(1  → 2)-β-d-glucopyranosyl ester (5), 3-O- β-d-glucopyranosyl-(1  → 2)-β- d-glucopyranosyl-6β,23-dihydroxyursolic acid 28-O- α-l-rhamnopyranosyl-(1  → 2)-β-d-glucopyranosyl ester (6), 3-O- β-d-glucopyranosyl-6 β,23-dihydroxyursolic acid 28-O- α-l-rhamnopyranosyl-(1  → 2)-β-d-glucopyranosyl ester (7), asiatic acid 28-O- α-l-rhamnopyranosyl-(1  → 2)-β-d-glucopyranosyl ester (8), and 3-O- β-d-glucopyranosylasiatic acid 28-O- α-l-rhamnopyranosyl-(1  → 2)-β-d-glucopyranosyl ester (9), thr...
Source: Journal of Natural Medicines - Category: Drugs & Pharmacology Source Type: research