Structures of homoerythrina alkaloids from cephalotaxus harringtonia

Phytochemistry
1972.0

Abstract

The structures of five minor alkaloids from Cephalotaxus harringtonia K. Koch var. harringtonia have been determined. These alkaloids are simple derivatives of schelhammericine (I). In alkaloid II, the methylenedioxy group of I is replaced by one hydroxyl group and one methoxyl group; alkaloid III is the analogous dimethoxy derivative. Alkaloids IV, V and VI are the corresponding C-3 epimers of alkaloids I, II and III. Though schelhammericine itself has not yet been observed in Cephalotaxus, alkaloids IV and V are identical in all respects with two alkaloids found in Schelhammera pedunculata. Alkaloids II, III and VI are previously unreported in the literature. The co-occurrence of these minor homoerythrina-type alkaloids (II-VI) with the major Cephalotaxus alkaloid cephalotaxine (VII) and its antileukemic esters (VIII-XI) is of interest biogenetically. © 1972.

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