Terpenoid and phenolic constituents from the roots of Ilex pubescens

Abstract

Five new metabolites, including two monoterpene glycosides Pubescenosides L-M (1-2) and three phenolic glycosides, Pubescenosides N-P (3-5), along with nineteen known ones, including liganoids, hemiterpenoids and caffeoylquinic acid derivates, were isolated from the roots of Ilex pubescens. Their structures were elucidated from extensive spectroscopic analysis, including 1D and 2D NMR experiments. This study is the first to report monoterpene glycosides with β-pinene aglycone in Aquifoliaceae. Nine of these compounds were evaluated in vitro for their anti-platelet aggregation activities. Among them, compounds 3 and 4 showed moderate inhibitory activities on ADP-induced blood platelet aggregation [inhibition (%): 32.3 and 33.6, respectively] as compared to aspirin.

Keywords: Anti-platelet aggregation; Aquifoliaceae; Ilex pubescens; Phenolic glycoside; Pubescenosides L–P; β-Pinene glycoside.