First isolated from various species of Stemmadenia, this alkaloid has subsequently
been found in DipZorrhynchus rondyZocarpon subsp. mossambiensis Benth. and
MeZodinus australis. The following specific rotations have been reported; [α]19D +
310° (c 0.527, pyridine), [α]20D~O + 329° (pyridine) and [α]25D~S + 324° (pyridine).
The alkaloid gives an ultraviolet spectrum exhibiting absorption maxima at 227,
284 and 292 m/J. with shoulders at 275 and 305 m/J.. One nitrogen atom is
tertiary, the other being part of the indole ring. The solution in concentrated
HN03 is a bright yellow.
Watts, Collera, Sandoval., Tetrahedron, 2, 173 (1958)
Stauffacher., HeZv. Chim. Acta, 44, 2006 (1961)
Sandoval et aZ., Tetrahedron Lett., 409 (1962)
Schumann, Schmid., HeZv. Chim. Acta., 46, 1996 (1963)
Linde., ibid, 48,1822 (1965)
