Alkaloids from the flower of Erythrina arborescens†
Abstract
Phytochemical investigations on the flower of Erythrina arborescens resulted in the isolation of eight new Erythrina alkaloid, erytharborines A–H (1–8), together with 17 known alkaloids. Erytharborines A/B (1–2) and C (3) possessed an 2H-imidazole ring and a unique oxime moiety, respectively. The structures were elucidated on the basis of UV, IR, mass spectrometry and NMR spectroscopic data.