New Coumarins from the Ailanthus altissima

Two new coumarin derivatives were isolated together with three known coumarins, artelin (3), isofraxidin (4), and scoploetin (5) from the bark of Ailanthus altissima (Simaroubaceae). New coumarin derivatives were elucidated as terpenylated coumarins, named altissimacoumarin A (1) and altissimacoumarin B (2), respectively. Trans-Configuration of between C-2' and C-9' in compound (1) was clearly confirmed by NOESY experiments.