Structural characterization of saturated pyrrolizidine alkaloids from Heliotropium transalpinum var. transalpinum Vell by NMR spectroscopy and theoretical calculations |
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Authors: | Janaina CM Medina Maria H Sarragiotto Ernani A Basso Juliana LB Peixoto |
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Institution: | Departamento de Química, Universidade Estadual de Maringá, Av. Colombo, 5790, 87020-900 Maringá, Paraná, Brazil |
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Abstract: | The chemical investigation of Heliotropium transalpinum var. transalpinum Vell. (Boraginaceae) led to the isolation of transalpinecine (1), a novel pyrrolizidine alkaloid, in addition to known alkaloids subulacine (1β-2β-epoxy-1α-hydroxymethyl-8α-pyrrolizidine) (2), and 1α-2α-epoxy-1β-hydroxymethyl-8α-pyrrolizidine (3). The structures of the isolated compounds were elucidated based on spectroscopic data and theoretical calculations. |
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Keywords: | Heliotropium Pyrrolizidine alkaloids Subulacine NMR Theoretical calculations and NBO |
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