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Sixteen alkaloids have been isolated from the fruits of Kopsia officinalis Tsiang and P.T.Li(Apocynaceae), a plant commonly used in folk medicine for treating tonsillitis and rheumatism. Tenof them were identified as known alkaloids-eburnamenine(1), kopsanone(2), 5, 18-dioxokopsan(3), kopsinilam(4), kopsinine(5), pleiocarpine(6), kopsamine(7), N-carbomethoxy-12-methoxykop-sinaline(8), N-carbomethoxy-11, 12-dimethoxykopsinaline (9) and(+)-vincadifformine (13). Theother three have now been proved to be new. They are N-carbomethoxy-11-hydroxy-12-methoxy-kopsinaline(10), N-carbomethoxy-11-methoxy-12-hydroxykopsinanne (11) and kopsamine N-oxide(12).
Sixteen alkaloids have been isolated from the fruits of Kopsia officinalis Tsiang and PTLi (Apocynaceae), a plant commonly used in folk medicine for treating tonsillitis and rheumatism. Ten of them were identified as known alkaloids-eburnamenine (1), kopsanone (2), Kopsinine (5), pleiocarpine (6), kopsamine (7), N-carbomethoxy-12-methoxykop-sinaline (8), N-carbomethoxy- They are N-carbomethoxy-11-hydroxy-12-methoxy-kopsinaline (10), N-carbomethoxy-11-methoxy -12-hydroxykopsinanne (11) and kopsamine N-oxide (12).