A 1H- and 13C-NMR study of seven ajmaline-type alkaloids.
1H- and 13C-NMR spectral data are presented for ajmaline (1), 17-O-acetylajmaline (2), isoajmaline (3), isosandwichine (4), rauflorine (5), vincamajine (6), and vincamedine (7). Some corrections to the previously reported assignments of compound 6 (1H-NMR) and compounds 3, 4 and 7 (13C-NMR) have been made. The 13C-NMR chemical shifts for rauflorine 5 are presented for the first time.
Jokela
R
R
Laboratory for Organic and Bioorganic Chemistry, Technical University of Helsinki, FIN-02150 Espoo, Finland.
Lounasmaa
M
M