ABSTRACT
Objective: To study the coumarins and alkaloids from the stems of Clausena lenis. Methods: The chemical constituents from the stems of C. lenis were separated and purified by silica gel, ODS, Sephadex LH-20 gel column chromatographies and preparative HPLC. Their structures were identified by physicochemical properties, spectroscopic analysis, as well as the comparisons with the data reported in literatures. Results: A total of 18 compounds were isolated from the 90% ethanol extract of the stems of C. lenis, which were identified as 6,8-diprenylumbelliferone (1), byakangelicin (2), tert-O-methylheraclenol (3), pabularinone (4), isogosferol (5), heraclenol (6), imperatorin (7), decursinol (8), xanthyletin (9), marmesin (10), skimmianine (11), kokusaginine (12), N-metilatanina (13), clausine Z (14), murrayanine (15), 2-methoxy-1-(3-methyl-buten-1-yl)-9H-carbazole-3-carbaldehyde (16), claulansine I (17) and clausehainanine A (18). Among them, compounds 1-10 were coumarins and 11-18 were alkaloids. Conclusion: All compounds are isolated from C. lenis for the first time, compounds 2, 3 and 8 are separated from the genus Clausena for the first time.