Sv. Dubovitskii et al., SYNTHESIS OF ISOCRYPTOLEPINE, AN ALKALOID FROM CRYPTOLEPIS-SANGUINOLENTA, Russian chemical bulletin, 45(11), 1996, pp. 2656-2657
Isocryptolepine, an alkaloid recently isolated from the roots of Crypt
olepis sanguinolenta, was synthesized by selective methylation at the
N(5) atom of 11H-indolo[3,2-c]quinoline with excess Mel in toluene.