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Petchia ceylanica

Three dimeric indole alkaloids of a new type, peceyline, peceylanine, and pelankine, have been isolated from a Sri Lankan apocynaceous plant, Petchia ceylanica Wight.876 The structures of these bases were determined mainly by n.m.r. spectroscopy. In their H spectra, all three alkaloids exhibit four aromatic singlets, one olefinic hydrogen multiplet, two methoxycarbonyl singlets, two N-methyl singlets, and two C-methyl doublets. One half of the non-aromatic carbon resonances in the 13C spectra show that one monomer unit is common to all three alkaloids, and inspection reveals that this unit must be based on vincorine... [Pg.188]

Petchidne (122), the third alkaloid of Petchia ceylanica, contains two more oxygen atoms than tabersonine 143). Its spectroscopic properties indicate that it is a member of the anilinoacrylate group, and its optical... [Pg.35]

Ajmalicine (80) was found to occur in Uncaria elliptica (72,73) and Petchia ceylanica (74), whereas its 10,11-dimethoxy derivative, reserpiline (81), and the C-20 epimer of 81, isoreserpiline (82), have been isolated from Neiososperma oppositifolia (75,76). Investigation of N. oppositifolia also... [Pg.47]

The Sri Lankan plant, Petchia ceylanica (Apocynaceae) provided several interesting bisindoles, including peceyline (387), peceylanine (i ), and pelankine... [Pg.245]

Two known alkaloids, tabersonine (141) and lochnericine (142), were encountered in Tabemaemontana dichotoma seeds (89) and Petchia ceylan-ica leaves (74), respectively. Almost simultaneous with the latter report, Atta-ur-Rahman, De Silva, and co-workers reported the isolation of two new Aspidosperma alkaloids, 19R-epimisiline (143), C21H24N2O4, mp 252° (decomp.), [a]D27 -382°, and 19S-epimisiline (144), C21H24N2O4, mp 198° (decomp.), [c ]D27 -399°, from the leaves of P. ceylanica (94). Both 19R-epimisiline and 195-epimisiline had identical UV, IR, and mass spectra. Their UV spectra were characteristic of an anilinoacrylate chromophore, and their IR spectra indicated the presence of OH, NH, and a,/3-unsaturated... [Pg.58]

See other pages where Petchia ceylanica is mentioned: [Pg.10]    [Pg.11]    [Pg.12]    [Pg.35]    [Pg.12]    [Pg.16]    [Pg.73]    [Pg.76]    [Pg.88]    [Pg.92]    [Pg.403]    [Pg.405]    [Pg.351]    [Pg.10]    [Pg.11]    [Pg.12]    [Pg.35]    [Pg.12]    [Pg.16]    [Pg.73]    [Pg.76]    [Pg.88]    [Pg.92]    [Pg.403]    [Pg.405]    [Pg.351]   
See also in sourсe #XX -- [ Pg.5 , Pg.135 , Pg.140 , Pg.147 , Pg.149 , Pg.173 ]

See also in sourсe #XX -- [ Pg.5 , Pg.135 , Pg.140 , Pg.147 , Pg.149 , Pg.173 ]

See also in sourсe #XX -- [ Pg.245 ]

See also in sourсe #XX -- [ Pg.351 ]



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