Alstonia

Alstonia constricta F. Muell. Alstonine (chlorogenine), alstonidine,... [Pg.716]

Alstonia macrophylla Wall. Villalstonine, macralstonine, macral-... [Pg.716]

Alstonia villosa Blum. Villalstonine, base V (Sharp (1-45). [Pg.716]

Two other alkaloids 47 and 48 were isolated in addition to Neooxygambirtannine 44 (67T3129). Anhydroalstonatine from Alstonia venenata is a closely related structure (77IJC(B)183) (Scheme 18). [Pg.88]

Deplancheine (7) was isolated first from the stem and bark of Alstonia deplanchei van Heurck and Muell. Arg. by Husson et al. (14). The structure of this novel type of alkaloid has been established from spectral evidence the trans annellation of rings C and D is supported by the presence of characteristic Bohlmann bands in the IR spectrum and also by the chemical shift of the C-3 proton below 3.7 ppm. The ethylidene side chain was also indicated by the H-NMR spectrum [8 1.52 (3H, d, J =6 Hz), 5.30 (1H, q, J = 6 Hz)] and its E configuration was confirmed by regio- and stereospecific total synthesis (14). 10-Methoxydeplancheine (8) has been found in the leaves of Alstonia lanceolifera... [Pg.145]

The quaternary alkaloid anhydroalstonatine (70), which has a completely aromatic yohimbane ring system, has been isolated from Alstonia venenata R.Br. (64). [Pg.157]

Venoxidine (Venenatine N-oxide) Alstonia venenata R.Br. (85) 218-219 -82.4° (82a) C22H28N2O5... [Pg.162]

Epiallo Series. Among alkaloids containing the epiallo yohimbane skeleton, only 3-epi-a-yohimbine (105) was formerly known. In the past decade, four additional members of this alkaloid subgroup have been isolated, namely, quatematine (106) from Alstonia quaternata (84), venenatine (107) and its N-oxide (venoxidine) from Alstonia venenata R.Br. (79, 80, 82a, 85) and 16-epivenenatine (108) also from Alstonia venenata R.Br. (81). [Pg.163]

Interestingly enough, racemic deplancheine (7) had been synthesized 6 years before the isolation of the alkaloid from the stem bark of Alstonia deplanchei van Heurck and Mull. Arg. (14). Winterfeldt and co-workers (112) treated enamine... [Pg.171]

Z)-Isositsirikine (602), with (R) absolute configuration at stereo center C-16, has been isolated from the leaves, fruit, and stem bark of Alstonia sphaerocapi-tata Boit (390). [Pg.418]

Evaluation of Phytochemicals and TLC optimization in Alstonia scholaris and Caesalpinia crista of Western Himalayan Region... [Pg.101]

Keywords Alstonia scholaris, Caesalpinia crista, Phytochemicals, TLC... [Pg.101]

Three cyclopentan- and cyclopenten-ones have been reported in the recent literature from endophytic fungal sources. Xylobovide (98), a previously known compound, was isolated from an unidentified endophyte from the leaves of the Australian tree Alstonia schoLtris, a known medicinal plant.Xylobovide has been reported previously to inhibit... [Pg.543]

Related alkaloids 19,20-Z-vallesamine (10a) and 19,20-E-vallesamine (10b) have been extracted from the leaves of Alstonia scholaris (87H(26)413), from the bark of Tabernaemontana dichotoma (85P2097) and from cell cultures Tabernaemontana divaricata (88MI393). [Pg.83]

Apocynaceae Alstonia macrophylla Talcarpine Pleiocarp amine Alstoumerine 2-O-epiantirhine Alstonerine Alstophyline Macralstonine Alstomacrophyline Villalstonine Alstomacroline Macrocarpamine... [Pg.37]

Keawpradub, N., Eno-Amooquaye, E., Burke, P. J. and Houghton, P. J. 1999. Cytotoxic activity of indole alkaloids from Alstonia macrophylla. Planta Medica, 65 311-315. [Pg.241]

See also in sourсe #XX -- [ Pg.14 , Pg.15 , Pg.16 ]

See also in sourсe #XX -- [ Pg.2 , Pg.3 , Pg.3 , Pg.3 , Pg.3 , Pg.4 , Pg.8 , Pg.9 , Pg.13 ]

See also in sourсe #XX -- [ Pg.329 , Pg.347 ]

See also in sourсe #XX -- [ Pg.9 , Pg.10 , Pg.11 , Pg.12 , Pg.13 , Pg.14 , Pg.15 , Pg.16 , Pg.17 ]

See also in sourсe #XX -- [ Pg.9 , Pg.105 , Pg.113 ]

See also in sourсe #XX -- [ Pg.17 , Pg.18 , Pg.21 ]

See also in sourсe #XX -- [ Pg.637 , Pg.640 , Pg.660 ]

See also in sourсe #XX -- [ Pg.9 , Pg.10 , Pg.11 , Pg.12 , Pg.13 , Pg.14 , Pg.15 , Pg.16 , Pg.17 ]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...