Studies on Orchidaceae Alkaloids. III. The Alkaloids in Dendrobium primulinum Lindl. and Dendrobium chrysanthum Wall.

Abstract
Two alkaloids, hygrine (1) and the hitherto unknown 5,7,-dimethyl-octahydroindolizine (II), were isolated from Dendrobium primulinum Lindl. 2,4-Dimethyl-6-propylpyridine was synthesized in order to identify one of the products from selenium dehydrogenation of II. I was also found to be the only alkaloid in Dendrobium chrysanthum Wall.

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