Voacanga chalotiana

A new alkaloid of Voacanga chalotiana,115 3 -hydroxyvobtusine (195), is identical with hydratoamataine, earlier546 postulated to be an intermediate in the conversion of amataine (194) into vobtusine (196). In consonance with the structure (195), reduction (by NaBH4) gives vobtusine (196), and dehydration gives amataine (194), this last reaction being accompanied by inversion of C-14, as previously noted.546... [Pg.191]

O-Acetyl-19,20-dihydrovoachalotine (156) is a new alkaloid, isolated from the root bark of Voacanga chalotiana 9lb the orientation at C-20 was deduced... [Pg.183]

Sarpagine-Ajmaline Group. Nuclear Overhauser effects have been demonstrated " between the C(15)-hydrogen and the C(18)-hydrogens and the C(6)-hydrogen and the C(9)-hydrogen, respectively, of dehydrovoachalotine (77a) from Voacanga chalotiana. ... [Pg.174]

Aspidosperma polyneuron Hazunta modesta var. brevituba Rauvolfia suaveolens Rauvolfia volkensii Strychnos potatorum Voacanga chalotiana... [Pg.113]

Voachalotine Alstonia legouixiae Ervatamia yunnanensis Peschiera buchtieni Peschiera campestris Tabemaemontana fuchsiaefolia Voacanga chalotiana... [Pg.114]

Of the new bases whose structures have been clarified quimbeline (221), from Voacanga chalotiana, differs from vobtusine only in having an ether bridge between the C-2 hydroxyl group and C-22 the structure (221) was deduced almost entirely from n.m.r. and mass spectral comparison with vobtusine, and confirmed by hydrogenolytic fission of the oxetan ring, which afforded vobtusine. [Pg.247]

B. Minor Alkaloids of Voacanga chalotiana Pierre et Stapf. 56... [Pg.41]

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