Abstract: Eight compounds and a mixture with two alkaloids have been isolated from the aerial parts of Ervatamia yunnanensis Tsiang.Their chemical structures and the composition of the mixture have been established as 19S-hydroxy-tacamine (1),19S-hydroxy-16-epi-tacamine(2),17-demethoxy-corynoxine B(3),17 -demethoxy-hydrocorynoxine B(4),ervatamine(5) and tabernaemontanine (6),neoandrographalide (7),β-sitosterol (8) and the mixture with 19,20-dehydroervatamine and 20-epi-ervatamine by means of spectral evidence.Compound(2) is a new one,while compounds(4) and (7) are reported for the first time from the family Apocynaceae.

Key words: Ervatamia yunnanensis, Apocynaceae, Indole alkloids

摘要： 从云南狗牙花(Ervatamia yunnanensis Tsiang)地上部分的乙醇提取物中分离到8个化合物和1个混碱，经光谱法分别鉴定为：19S-hydroxy－tacamine(1)、19S－hydroxy－16-epitacamine(2)、17-demethoxy- corynoxine B(3)、17-demethoxy-hydrocorynoxine B(4)、ervatamine(5)、tabernaemontanine(6)、新穿心莲内酯(7)和β-谷甾醇(8)；混碱系由19，20－dehydroervatamine和20-epi-ervatamine组成。化合物(2)为新生物碱。化合物(4)和(7) 系首次从夹竹桃科植物中获得。

关键词: 云南狗牙花, 夹竹桃科。吲哚生物碱