Baluchistine and a new phenolic bisbenzylisoquinoline alkaloid aquifoline were isolated from a mixture of tertiary alkaloids from the underground part of Mahonia aquifolium (PURSH) NUTT. On the basis of thin-layer chromatography these compounds also occur in the stem and seeds of the investigated plant.
Dimeric compounds 5,5’-oxydi(3-methyl-3-pyrrolin-2-one) and 5-hydroxy-3-methyl-1-(3’-methyl-2’-oxo-3’-pyrrolin-2-one were isolated from bulbs of Lilium candidum L., family Liliaceae. Structure of these compounds has been confirmed by spectral measurements. The ether link between two substituted pyrroline rings represents a new type of dimeric alkaloids.
The previously proposed α-orientation for the C(16)-hydroxyl group of the alkaloid veramarine (Ia) has been revised; the 1H and 13C NMR data of Ia and the base-catalyzed solvolysis of its O-diacetate Id evidenced veramarine to be (25S)-cev-5-enine-3β,16β,20β-triol (Ib).
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