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Pseudoxandra lucida

An abstract stating preliminary results of an investigation of the Colombian plant, Pseudoxandra lucida (Annonaceae), has appeared. The new bases oxandrine (251) and pseudoxandrine (252) were isolated and characterized by spectroscopic means. These alkaloids are the first keto biphenyl-linked bases and are possible intermediates in the biogenesis of seco biphenyl alkaloids 126). Details on these and two related alkaloids have recently been published 126a). [Pg.66]

Antioquine IV.l 1 Pseudoxandra lucida Stem bark Colombia 114... [Pg.252]

Antioquine (466), C37H40N206, mp 197°C [a]D +214° (c 0.9, CHC13), was isolated from a sample of Pseudoxandra aff. lucida Fries (Annonaceae) collected in Colombia. Structure proof was by spectral characterization of the O,O-diacetate, the 0,0-dimethyl ether, and the 7-O-methyl ether, and by degradation of derivatives with KMn04/Me2C0, with ceric ammonium nitrate, and with Na/NH3 (551). [Pg.177]

Secantioquine (512), C37H3gN2Og, amorphous, [a]D —15° (c 1, CHC13), was obtained from Pseudoxandra aff. lucida (Annonaceae). The structure was deduced from the UV base shift, NMR, and formation of secantioquine 0,O-diacetate by oxidation (KMn04/Me2CO) of the 0,0-diacetyl derivative of antioquine (466). Secantioquine is the first biphenyl-linked seco bisbenzyltetrahydroisoquinoline alkaloid (551,568). [Pg.191]

Known as an in vitro oxidation product of obaberine (80) (39), seco-obaberine (378) has recently been isolated from Pseudoxandra aff. lucida as an amorphous material,... [Pg.191]

A second of the three subgroups is made up of three secobisbenzylisoquinoline alkaloids baluchisanamine (257) from Berberis baluchistanica (Berberidaceae), secohomoaromoline (432) from Anisocycla jollyana (Menispermaceae), and seco-obaberine (269) from Pseudoxandra aff. lucida (Annonaceae). Only the nature of the groups at C(12) and C(7 ) differ in these three compounds, with some being phenolic and some being methyl ethers. [Pg.194]

The only alkaloid of this group is secolucidine (393), which is a secobisbenzylisoquinoline that has only been found in Pseudoxandra sclerocarpa (Annonaceae). The precursor to this alkaloid could have been medelline (318) from Pseudoxandra aff. lucida (Annonaceae), found in another subgroup of this series. [Pg.250]

Medelline (318) is the only alkaloid in this group. This compound has been isolated from just Pseudoxandra aff. lucida (Annonaceae). Medelline is a diastereoisomer of tiliacorine (118) and tiliacorinine (119). [Pg.253]

See other pages where Pseudoxandra lucida is mentioned: [Pg.275]    [Pg.73]    [Pg.288]    [Pg.302]    [Pg.302]    [Pg.309]    [Pg.309]    [Pg.275]    [Pg.73]    [Pg.288]    [Pg.302]    [Pg.302]    [Pg.309]    [Pg.309]    [Pg.287]    [Pg.287]    [Pg.195]    [Pg.4]    [Pg.29]    [Pg.38]    [Pg.39]    [Pg.39]    [Pg.43]    [Pg.43]    [Pg.44]    [Pg.45]    [Pg.99]    [Pg.185]    [Pg.186]    [Pg.188]    [Pg.100]   
See also in sourсe #XX -- [ Pg.275 ]



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