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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
Published on: August 14, 2019
Two new flavonol glycosides from Otostegia limbata BENTH
Afsar Khan1, Viqar Uddin Ahmad, Umar Farooq
1H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan.
Abstract:
A BuOH-soluble part of the methanolic extract from the roots of Otostegia limbata yielded two new flavonol glycosides; kaempferol 3-O-[beta-D-glucopyranosyl-(1-->2)-[beta-D-glucopyranosyl-(1-->3)]-[beta-D-glucopyranosyl-(1-->4)]-alpha-L-rhamnopyranoside]-7-O-[alpha-L-rhamnopyranoside] (1) and kaempferol 3-O-[beta-D-glucopyranosyl-(1-->4)-beta-D-6'''''[4-hydroxy (E)-cinnamoyl]glucopyranosyl-(1-->3)-[beta-D-glucopyranosyl-(1-->2)]-alpha-L-rhamnopyranoside]-7-O-[alpha-L-rhamnopyranoside] (2). The structures of these compounds were elucidated by spectroscopic and chemical means. To the best of our knowledge, these are the largest flavonoids derivatives described so far from the genus Otostegia.
