A New Phenolic Diglycoside Produced in Response to Copper Toxicity and a New Flavan Dimer from the Leaves of Viburnum ichangense (HEMSL.) REHD.

[摘要]：A new phenolic digycoside 1 was produced as stress metabolite in the fresh leaves of Viburnum ichangense (HEMSL.) REHD., in response to abiotic stress elicitation by CuCl(2). The stress metabolite was characterized as 1-O-[alpha-L-arabinofuranosyl(1 -> 6)-beta-D-glucopyranosyl]-erythro-1,2-bis(4-hydroxy-3-methoxyphenyl)propane-1,3-diol (1). A new flavan dimer, 2,3-epoxyflavan-3',4',5,7-tetraol-(4 -> 8 '')-flavan-3 '',3''',4''',5''',6 ''-pentaol (2), and two known compounds, hovetrichoside A (3) and asperglaucide (4), were also isolated. Their structures were established by spectroscopic means.

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