The correlation between the stereochemistry of some indole and oxindole alkaloids and their behaviour on thin layer chromatograms

Abstract

Thin layer chromatography may be used to distinguish between indole alkaloids having cis or trans C/D and D/E ring junctions, with or without methoxy substituents, and with vinyl groups instead of ethyl groups at C-20. The behaviour on thin layer chromatograms of some new indole and oxindole alkaloids from Mitragyna species has been examined and proposals made for their stereochemical differences.