Medicinal Flowers. XXII. Structures of Chakasaponins V and VI, Chakanoside I, and Chakaflavonoside A from Flower Buds of Chinese Tea Plant (Camellia sinensis)
Two acylated oleanane-type triterpene oligoglycosides, chakasaponins V and VI, an aromatic glycoside, chakanoside I, and an acylated flavonol oligoglycoside, chakaflavonoside A, were isolated from the flower buds of Chinese tea plant [Camellia sinensis (L.) O. KUNTZE]. The chemical structures of those new glycosides were elucidated on the basis of chemical and physicochemical evidence.
A discovery strategy relying on the identification of fragments through resolution of a constitutional dynamicsystem, coupled to subsequent static ligand design and optimization, yielded a range of β‐galactosidase inhibitors. Inhibition studies provided important structural information for the compounds, of which 1‐thiobenzyl‐β‐D‐galactopyranoside demonstrated the best inhibitory effects.