Chemistry of Fijian Plants. 13. Floribundal, a Nonglycosidic Bisiridoid, and Six Novel Fatty Esters of δ-Amyrin from Scaevola floribunda

Floribundal (1), the first example of a nonglycosidic bisiridoid has been isolated from the heartwood of Scaevola floribunda and its structure and relative stereochemistry determined by NMR spectroscopy and molecular modeling. The aglycon 2 of loganin was also isolated. A mixture of six novel δ-amyrin fatty esters with C20−C30 acid moieties (7−12) were isolated from the bark of S. floribunda and their structures elucidated by NMR and HRMS of the parent compounds and their hydrolysis products. The bark also contains the triterpenes δ-amyrin (13) and δ-amyrin acetate (14), and ursolic acid acetate, betulinic acid, and betulin.