Chemical constituents of Murraya euchrestifolia Hayata. Structures of novel carbazolequinones and other new carbazole alkaloids.

Thirteen carbazole alkaloids were isolated from Murraya euchrestifolia HAYATA (Rutaceae) collected in Taiwan. Four of them are novel carbazolequinones [murrayaquinone-A (7), -B (8), -C (9), and -D (10)], isolated for the first time from natural sources. Three of others are new alkaloids having the normal carbazole nucleus [murrayafoline-A (1), -B (2), and (+)-murrayazoline (11)]. These structures were elucidated from spectral data and chemical transformations.