Azafluorenones from Oxandra cf. major and biogenetic considerations☆

Azafluorenones from Oxandra cf. major and biogenetic considerations☆ New Azafluorene Alkaloids from Oxandra xylopioides Three bis-dehydroaporphines from Oxandra cf. major Azafluorene and Aporphine Alkyloids from Polyalthia longifolia Two New Natural Azafluorene Alkaloids and a Cytotoxic Aporphine Alkaloid from Polyalthia longifolia Alkaloids from stem barks of Oricia renieri and Oricia gabonensis New Oxoaporphine Alkaloids from Hernandia nymphaeifolia Azafluorenones and azaanthraquinone from Guatteria dielsiana Chemical Studies on the Annonaceae – VI. The Alkaloids of the Stem and Fruit of Monanthotaxis cauliflora¹ Kinabaline and the aporphinoid biogenesis-of azaanthracene and azafluorene alkaloids☆