Aspidosperma populifolium

Although the alkaloids of Aspidosperma populifolium are preponderantly of the aspidofractinine type, one of them (CCXXIV-A) was clearly excluded from this class by its IR- (ACHCl3 5.98 and 6.25 p, MeC C—C=C) and UV- (Table III) spectra. The latter was somewhat similar to that of condylocarpine (CCXV), the differences being accountable to an aromatic methoxyl group whose presence was indicated by the NMR-spectrum (OCH3, 3.74 S, coincident with the CC Me peak 3 aromatic protons only). A further difference from condylocarpine and akuammicine lay in the presence of an ethyl (0.70 S, triplet) rather than ethylidene side chain. 

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