目的 对决明属植物光叶决明Cassia floribunda茎叶的化学成分进行研究。方法 运用硅胶、MCI、RP-₁₈、TLC、HPLC等多种色谱技术进行分离纯化，根据理化性质和波谱数据鉴定化合物的结构。结果 从光叶决明90%乙醇提取物中分离得到18个化合物，分别鉴定为决明顺反二聚苯丙素（1）、反式对羟基肉桂酸乙酯（2）、shonanin（3）、邻苯二甲酸二丁酯（4）、1，6，8-三羟基-3-甲基蒽醌（5）、2，5-二甲基-7-羟基-色原酮（6）、2-（2'-羟丙基）-5-甲基-7-羟基色酮（7）、4'，7-二羟基-5-甲氧基黄酮（8）、柯伊利素（9）、山柰酚（10）、芹菜素（11）、3-甲氧基槲皮素（12）、6-demethoxycapillarisin（13）、7，4'-二羟基黄酮（14）、木犀草素（15）、butin（16）、甘草素（17）和圣草酚（18）。结论 化合物1为新的苯丙素类化合物；化合物2~18均为首次从该植物中分离得到，其中，化合物2~4、8、9、11、13、14、16~18为首次从决明属植物中分离得到。

Objective To study the chemical composition of the stems and leaves of Cassia floribunda. Methods The chemical constituents from stems and leaves of C. floribunda were isolated by silica gel MCI, RP-₁₈, TLC, and HPLC methods. Their structures were elucidated by spectroscopic methods and physicochemical properties. Results Eighteen compounds were isolated from the 90% EtOH extract of C. floribunda and their structures were established as cassia cis-trans diphenylpropanoid (1), ethyl p-hydroxycinnamate (2), shonanin (3), dibutyl phthalate (4), 1,6,8-trihydroxyl-3-methyl-anthraquinone (5), 2,5-dimethyl-7-hydroxyl-chromogen, (6), 2-(2'-hydroxypropyl)-5-methyl-7-hydroxytryptophan (7), 4',7-dihydroxy-5-methoxy flavone (8), chrysoeriol (9), kaempferol (10), apigenin (11), 3-methoxy quercetin (12), 6-demethoxycapillarisin (13), 7,4'-dihydroxyflavone (14), luteolin (15), butin (16), liquiritigenin (17) and eriodictyol (18). Conclusion Compound 1 is a new compound, and 2-18 are isolated from this plant for the first time. At the moment, 2-4, 8, 9, 11, 13, 14, 16-18 are isolated from Cassia for the first time.

R284.1

国家自然科学基金资助项目（21562046）；云南省应用基础研究项目（2016FB022）