Abstract
Two new Lycopodium alkaloids, acetyllycoposerramine M and palcernine A were isolated from whole plant extracts of Palhinhaea cernua L. together with ten previously identified compounds. The structures of the new compounds were elucidated by spectroscopic methods and single-crystal X-ray diffraction analyses using the Flack parameter.
Highlights
The results of the analysis revealed the absolute configuration of 1 to be 4R, 7R, 11R, 12R, 15R in light of the Flack parameter of 0.0(2), using anomalous dispersion with copper radiation.[20,21,22]
Two new Lycopodium alkaloids, acetyllycoposerramine M and palcernine A were isolated from whole plant extracts of Palhinhaea cernua L. together with ten previously identified compounds
The structures of the new compounds were elucidated by spectroscopic methods and single-crystal X-ray diffraction analyses using the Flack parameter
Summary
The results of the analysis revealed the absolute configuration of 1 to be 4R, 7R, 11R, 12R, 15R in light of the Flack parameter of 0.0(2), using anomalous dispersion with copper radiation.[20,21,22] 1 was elucidated as acetyllycoposerramine M. Based on the HMBC correlations (Figure 4) of H-2a/C-4, H-17a/C-2 & C-3, H-17a & H-3a/C-5, H-10b/C-12, H-11β/C-7 & C-13, H-8α/C-6, C-7 & C-12, H-15/C-13, and H3-16/C-14 & C-13, a fawcettimine skeleton of 2 was determined, and the double bond was located at C-6, and two ketone groups were located at C-5 and C-13, respectively.
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