Polycyclic Polyprenylated Xanthones from <i>Symphonia globulifera</i>: Isolation and Biomimetic Electrosynthesis
作者:Kevin Cottet、Anne Neudörffer、Marina Kritsanida、Sylvie Michel、Marie-Christine Lallemand、Martine Largeron
DOI:10.1021/acs.jnatprod.5b00239
日期:2015.8.28
Two regioisomeric polycydic xanthones, 3,16-oxyguttiferone A (2) and 1,16-oxyguttiferone A (3), which are polyprenylated acylphloroglucinol-derived analogues, were isolated from the seeds of Symphonia globulifera, together with their presumed o-dihydroxybenzoyl precursor, guttiferone A (1). Anodic oxidation of 1 into the corresponding o-quinone species proved to be an efficient biomimetic method to generate xanthones 2 and 3 in high overall yield and to confirm their structures. Both compounds displayed cytotoxicity against the HCT 116 colon carcinoma cell line with IC50 values of 8 and 3 mu M, respectively.