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Paper | Regular issue | Vol 48, No. 9, 1998, pp.1777-1791
Published online, 1st January, 1970
DOI: 10.3987/COM-98-8201
The Gracilines: A Novel Subgroup of the Amaryllidaceae Alkaloids

Seda Noyan, Gudrun Hopp Rentsch, Mustafa Ali Önür, Tekant Gözler, Belkis Gözler, and Manfred Hesse*

*Organisch-chemisches Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland


A new subgroup of the Amaryllidaceae alkaloids having a 10b,4a-ethanoiminodibenzo[b,d]pyrane (2-benzopyrano[3,4-d]indole) uncleus is isolated from two different Galanthus species as three novel monomeric alkaloids, (+)-graciline (1), (+)-11-acetoxygraciline (2) and (+)-3,4-dihydro-3-hydroxygraciline (3). The fourth new compound, (-)-digracine (4) is a dimer of two such moieties.