The World Botanical Associates Web Page
Prepared by Richard W. Spjut
December 2004

Esenbeckia flava
Cape Region, BCS
Spjut 5397, Mar 1979


Nakatsu T., T. Johns, I. Kubo, K. Milton, M. Sakai, K. Chatani, K. Saito, Y. Yamagiwa and T. Kamikawa.  1990. Isolation, structure, and synthesis of novel 4-quinolinone alkaloids from Esenbeckia leiocarpa.  J. Nat. Prod. 53(6): 15081513. Two new biocidal quinolinone alkaloids, 3-methoxy-1-methyl-2-propyl-4-quinolone [1] and 2(1'-ethylpropyl)-1-methyl-4-quinolone [2], were efficiently isolated using reversed-phase recycling hplc from the leaves of Esenbeckia leiocarpa. The structures were determined through spectroscopic data and confirmed by total synthesis. These alkaloids have antifeedant activities against the pink bollworm, Pectinophora gossypiella.