Acylated flavonol glycosides from Eugenia jambolana leaves

Two acylated flavonol glycosides and 15 known polyphenols have been isolated and identified from the leaves of Eugenea jambolana Lam. The structures of the new compounds were identified as 3-O-(4 " -O-acetyl)-alpha -L-rhamnopyranoside of mearnsetin (myricetin 4'-methyl ether) and myricetin 3-O-(4 " -O-acetyl-2 " -O-galloyl)-alpha -L-rhamnopyranoside. The complete structure elucidation of all isolated metabolites based on chemical and spectroscopic methods of analysis (UV, 1D and 2D NMR) as well as negative ESI-MS with and without CID in-source fragmentation. (C) 2001 Elsevier Science Ltd. All rights reserved.