0000000001312034
AUTHOR
Lukas Brieger
Cytotoxic bufadienolides from the leaves of a medicinal plant Melianthus comosus collected in South Africa.
Abstract From the leaves of South African medicinal plant Melianthus comosus, four previously undescribed bufadienolides, 16β-formyloxymelianthugenin (1), 2β-acetoxymelianthusigenin (2), 2β-hydroxy-3β,5β-di-O-acetylhellebrigenin (3), and 2β-acetoxy-5β-O-acetylhellebrigenin (4) were isolated together with two known bufadienolides. The structural elucidation of the compounds was based on 1D and 2D NMR spectroscopy, high-resolution mass spectrometry, and other spectroscopic methods. The relative configurations were determined by single-crystal X-ray crystallography analysis and NOESY correlations. The isolated compounds displayed strong cytotoxicity against MCF-7 breast cancer cells, sensitive…
Cytotoxic Bufadienolides from the Leaves of Melianthus major
Melianthus major is a medicinal plant endemic to South Africa. Its leaf extract led to the isolation of five new bufadienolides, 2β-acetoxy-3,5-di-O-acetylhellebrigenin (1), 2β-acetoxy-3-O-acetylhellebrigenin (2), 2β-acetoxy-14-deoxy-15β,16β-epoxymelianthugenin (4), 2β-acetoxy-14-deoxy-15β,16β-epoxymelianthusigenin (5), and 2β-hydroxymelianthusigenin (6), and four known analogues. The structures of the compounds were elucidated using NMR and HRESIMS data analyses. The relative configurations were defined by single-crystal X-ray crystallography and NOESY correlations. The isolated compounds exhibited strong cytotoxicity against MCF-7 breast cancer cells and sensitive CCRF-CEM and multidrug-r…
CCDC 1981430: Experimental Crystal Structure Determination
Related Article: Kibrom Gebreheiwot Bedane, Lukas Brieger, Carsten Strohmann, Ean-Jeong Seo, Thomas Efferth, Michael Spiteller|2020|Bioorg.Chem.|102|104102|doi:10.1016/j.bioorg.2020.104102
CCDC 1961566: Experimental Crystal Structure Determination
Related Article: Kibrom Gebreheiwot Bedane, Lukas Brieger, Carsten Strohmann, Ean-Jeong Seo, Thomas Efferth, Michael Spiteller|2020|J.Nat.Prod.|83|2122|doi:10.1021/acs.jnatprod.0c00060
CCDC 1961567: Experimental Crystal Structure Determination
Related Article: Kibrom Gebreheiwot Bedane, Lukas Brieger, Carsten Strohmann, Ean-Jeong Seo, Thomas Efferth, Michael Spiteller|2020|J.Nat.Prod.|83|2122|doi:10.1021/acs.jnatprod.0c00060
CCDC 1981431: Experimental Crystal Structure Determination
Related Article: Kibrom Gebreheiwot Bedane, Lukas Brieger, Carsten Strohmann, Ean-Jeong Seo, Thomas Efferth, Michael Spiteller|2020|Bioorg.Chem.|102|104102|doi:10.1016/j.bioorg.2020.104102