Pausinystalia macroceras

Recent extractions440 of the leaves of Cinchona ledgeriana have resulted in the isolation of quinamine (previously observed), 3-ep/-quinamine, aricine, and a new alkaloid which may prove to be stereoisomeric with quinamine. 11-Hydroxy-pleiocarpamine occurs in Vinca erecta 4b and herbacine and herbaine in V. herbacea.44c Yohimbine appears to be the major alkaloid of the trunk bark of Pausinystalia macroceras, in which it occurs with four other alkaloids of this group.44d Pleiocarpamine occurs in association with nine alkaloids of the aspidospermine-eburnamine group in the stem and root bark of Hunteria elliottii (Stapf.) Pichon.44e... 

Calycanthine has been isolated44 from Pausinystalia macroceras this is the first report of the occurrence of this alkaloid in this genus. 

Three calycanthine-type alkaloids, (—)-calycanthine (149) (the optical antipode of (+ )-calycanthine (150)), (—)-isocalycanthine (151), and we,so-chimonanthine (152) were isolated from Psychotria forsteriana, from New Caledonia, and complete and NMR assignments were reported (101). This represents the second isolation of the levorotatory isomer of calycanthine (the first was from Pausinystalia macroceras, Rubiaceae, (102)) as well as the first isolation of we,so-chimonanthine. (—)-Calycanthine and (+ )-chimonanthine (153) were also found to occur in the skin of the Colombian poison dart frog, Phyllobates terribilis (103). 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ ]

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