Henrycinols A and B, Two Novel Indole Alkaloids Isolated from <i>Melodinus henryi</i><scp>Craib</scp>

Abstract

Abstract Henrycinols A ( 1 ) and B ( 2 ), two novel indole alkaloids, together with three known compounds, (+)‐Δ 14 ‐vincamine ( 3 ), (+)‐16‐epi‐Δ 14 ‐vincamine ( 4 ), and (+)‐isoeburnamine ( 5 ), were isolated from the roots of Melodinus henryi Craib . Their structures were established on the basis of 1D‐ and 2D‐NMR spectroscopic analysis. The relative configuration of henrycinols A and B was determined by NOESY analysis.