Chemical Studies on the Annonaceae – VI. The Alkaloids of the Stem and Fruit of Monanthotaxis cauliflora¹

Abstract

Alkaloids have been isolated, in trace amounts only, from the whole stem and mature fruits of Monanthotaxis (Popowia) cauliflora (Chipp) Verdc. From the . stem four alkaloids, three aporphines and a tetrahydroprotoberberine, were obtained. Two of the three aporphines were identified as nuciferine and asimilobine and evidence is presented that the third is the apparently novel 9–hydroxy–1,2– dimethoxy–noraporphine. The tetrahydroprotoberberine was identified as stepholidine. The two alkaloids from the fruit were partially identified as a 1,2–substituted–9–methoxy–7–hydroxyaporphine and a dihydroxy–dimethoxy–noraporphine, probably laurelliptine.

Key Word Index

Monanthotaxis cauliflora - Annonaceae - Aporphine Alkaloids - Tetrahydroprotoberberine Alkaloids