Dimeric Quinolinone Alkaloids

5 Dimeric Quinolinone Alkaloids.- The first dimeric quinolinone alkaloids, pteledimerine and the closely related pteledimeridine, are constituents of Ptelea trifoliate (cf. Vol. 10, p.80 and Vol. 

Two new types of dimer have now been identified, represented by paraensidimerin D and by the vepridimerines. 

Several dimeric alkaloids were isolated from the heartwood of 

The barks of Vepris louisli and Orlcia renieri contain isomeric 

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A considerable number of new quinoline and acridone alkaloids has been identified and the recognition of two new groups of dimeric quinolinone alkaloids is of particular interest. There has been little activity in the quinazoline alkaloid area and this section is omitted this year. 

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