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• W2090735502 abstract "The fragmentation of six plumeran indole alkaloids (PIAs) previously isolated from Aspidosperma spruceanum has been investigated by electrospray ionization tandem mass spectrometry (ESI-MS/MS) in the positive ion mode. The fragmentation pathways have been established on the basis of MS/MS experiments using fragment ions generated in-source and deuterium-labeled alkaloids as precursor ions and on the basis of accurate mass measurements. Our results demonstrated that the fragmentation routes observed for the protonated PIAs are essentially derived from a pericyclic reaction and from the opening of rings D and E, followed by 1,4-hydrogen rearrangements. Product ions resulting from radical eliminations were also observed, contrary to the 'even-electron rule'. Our data reveals that some product ions from protonated PIAs provide crucial information for the characterization of the acyl substituent at N-1, the methoxyl and hydroxyl groups at the aromatic moiety, and give evidence of an ether bridge between C-18 and C-21. The data reported here were used for the dereplication of these compounds in a stem bark methanolic extract of Aspidosperma spruceanum." @default.
• W2090735502 created "2016-06-24" @default.
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• W2090735502 date "2010-01-04" @default.
• W2090735502 modified "2023-10-09" @default.
• W2090735502 title "Fragmentation of plumeran indole alkaloids from<i>Aspidosperma spruceanum</i>by electrospray ionization tandem mass spectrometry" @default.
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• W2090735502 doi "https://doi.org/10.1002/rcm.4389" @default.
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