Ervatamia hainanensis

The already known geissoschizol (7, C19H24N20, MP 224-226°C, [a]D -70°) 184) and its 10-hydroxy derivative (8, C19H24N202, MP 264°C) (184), were isolated from the roots of T. bufalina (Ervatamia hainanensis) (53). The detailed analysis of the H-NMR spectra of 7 and 8 diacetate were reported (Table III) and the assignment of all of the protons was made by application of consecutive double-resonance experiments. 

A new amorphous alkaloid has been recently isolated from the Chinese plant T. bufalina (Ervatamia hainanensis) collected on Hainan Island (53). Its mass spectrum showed a molecular ion at m/z 382, corresponding to C23H30N2O3. From the fragmentation pattern, this compound would appear to be a coronaridine derivative in which a C2H50 unit is attached to the aliphatic moiety of the molecule. The structure 111 with (S) configuration at C-3 was determined by a detailed analysis of its H-NMR spectrum (Table IV) in comparison with the data of other ibogan alkaloids. 

Liu ZW, Yang TT, Wang WJ, Li GQ, Tang BQ, Zhang QW, et al. Ervahainine A, a new cyano-substituted oxindole alkaloid from Ervatamia hainanensis. Tetrahedron Lett 2013 54(48) 6498-500. 

Feng XZ, Kan C, Potier P, Kan SK et al. 1982 Monomeric indole alkaloids from Ervatamia hainanensis. Planta Med 44 212-214... 

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