NMR spectral assignments of three aspidofractinine alkaloids, kopsine, fruticosine and fruticosamine

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Abstract

1D and 2D NMR techniques were used to assign fully the spectra of three aspidofractinine alkaloids, kopsine (1), fruticosamine (2) and fruticosine (3), isolated from a cultivated specimen of the plant Kopsia fruticosa (Apocynaceae). The assignment of the NMR data for 1, 2 and 3 will help in the future assignments of related alkaloids. Copyright © 2005 John Wiley & Sons, Ltd.

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