Bonafousia tetrastachya

Hydroxyvincadifformine (71, C21H26N203, [a]0 —427°) was isolated from T. siphilitica (Bonafousia tetrastachya) and characterized by the presence of a base peak at mlz 124 (284) in the mass spectrum and by comparison of the CMR spectrum with that of vincadififormine (70) (779). 

The occurrence of geissoschizine in the leaves of Rhazya stricta has been confirmed,5Sa and it has also been isolated from Bonafousia tetrastachya.SSb... 

In the Voacanga series, conodurine and voacamine are among the alkaloids of Peschiera laeta,62 and the symmetrical dimer 12,12 -bis-ll-hydroxycoronaridine (245) occurs in the leaves of Bonafousia tetrastachya.149... 

Details of the X-ray crystal-structure analysis of the bis-strychninoid alkaloid sungucine have been published,132 as well as details on the chemical and crystallographic determination of the structure of bonafousine.133 Isobonafousine (304), another constituent of the leaves of Bonafousia tetrastachya (Humboldt,... 

An alkaloid of a less familiar type, containing isovoacangine and hydrocanthine components, is bonafousine (252), the major alkaloid of a genus not previously investigated, Bonafousia tetrastachya (Humboldt, Bonpland, and Kunth) Markgraf. The structure was determined by the X-ray method, and the absolute configuration from the c.d. spectrum of its O-methyl ether. 

Two further bisindole alkaloids, which belong to the Aspidosperma-iboga group, have been extracted from the leaves of Bonafousia tetrastachya. The structures of both alkaloids were deduced from a thorough analysis of their mass and... 

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