Five alkaloids were isolated from ripe fruits of Evodia rutaecarpa HooK. f.et THOMS. Four of these were found to be indoloquinazoline type alkaloids: rutecarpine (I), evodiamine (II) and two new alkaloids, dihydrorutecarpine (IV) and its 14-formyl derivative (III). The remaining one was a new quinolone alkaloid, 1-methyl-2-nonyl-4(1H)-quinolone (V). The synthesis of II, III and IV was also achieved. © 1978, Japan Society for Bioscience, Biotechnology, and Agrochemistry. All rights reserved.