Furoquinoline alkaloids from the southern African Rutaceae Teclea natalensis

The leaves of Teclea natalensis have yielded two furoquinoline alkaloids, 6-[(2,3-epoxy-3-methylbutyl)oxy]-4,7-dimethoxyfuro[2,3- b]quinoline 1 and 4,7-dimethoxy-6-[(3-methyl-2-butenyl)oxy]furo[2,3- b]quinoline 2, and the known alkaloids 4,7-dimethoxy-8-[(3-methyl-2-butenyl)oxy]furo[2,3- b]quinoline, flindersiamine and dictamnine. The chloroform and ethyl acetate extracts of the leaves of Teclea natalensis have yielded two furoquinoline alkaloids, 6-[(2,3-epoxy-3-methylbutyl)oxy]-4,7-dimethoxyfuro[2,3- b]quinoline and 4,7-dimethoxy-6-[(3-methyl-2-butenyl)oxy]furo[2,3- b]quinoline, and the known alkaloids 4,7-dimethoxy-8-[(3-methyl-2-butenyl)oxy]furo[2,3- b]quinoline, flindersiamine and dictamnine.