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Tetrahydroprotoberberine methiodide

Allocryptopine (101b) was synthesized from tetrahydroprotoberberine methiodide in one step by photooxygenation (673). The methosulfate of... [Pg.462]

Pyrolysis of tetrahydroprotoberberine methiodides is reported to yield, in addition to the expected iV-demethylation product, 13-methyl tetrahydroprotoberberine via migration of the 7V-methyl group to C-13. This rearranged product possesses a rm -quinolizidine system with the 13-methyl group occupying the axial position. (For the base-catalyzed rearrangement of iV-methyltetrahydroprotoberberine salts to spirobenzylisoquinolines, see Sec. 25.2.7.)... [Pg.233]

Several new suggestions concerning the biogenesis of the rhoeadines have appeared. Using Papaver bracteatum Lindl. plants, it has been demonstrated that [N- CHa, 8- C]-( )-tetrahydropalmatine methiodide is incorporated with high efficiency into alpinigenine. A mechanism was therefore proposed which involves C-14 hydroxylation of the quaternary tetrahydroprotoberberine salt, followed by cleavage of the bond between N-7 and C-14. ... [Pg.349]

See other pages where Tetrahydroprotoberberine methiodide is mentioned: [Pg.139]    [Pg.139]    [Pg.239]    [Pg.458]   
See also in sourсe #XX -- [ Pg.462 ]



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Methiodides

Tetrahydroprotoberberine

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