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13 C nuclear magnetic resonance spectral and conformational analysis of naturally occurring tetrahydrofuran lignans

1979; NRC Research Press; Volume: 57; Issue: 4 Linguagem: Inglês

10.1139/v79-071

1480-3291

Sebastião Ferreira Fonseca, Lauro Euclides Soares Barata, Edmundo A. Rúveda, Paul Baker,

Plant-derived Lignans Synthesis and Bioactivity

The 13 C nmr spectra of the naturally occurring stereoisomers of the tetrahydrofuran lignans were recorded and the signals assigned. Based on these assignments, on the observed sensitivity of the benzylic carbon shifts to the orientation of the aryl groups, and on the comparison with previously reported 1 H nmr data, the most probable conformations for the mentioned stereoisomers are suggested.