Base-catalyzed intramolecular condensation of tokinolide B
作者:Beatriz Quiroz-Garcı́a、Liliana Hernández、Rubén A. Toscano、Olov Sterner、Guillermo Delgado
DOI:10.1016/s0040-4039(03)00291-0
日期:2003.3
The novel pentacyclic compound cyclotokinolide B was obtained from the natural phthalide tokinolide B under basic conditions, via the chemoselective γ-enol lactone opening followed by a Michael addition of the generated carbanion to the enone and subsequent equilibration. This result confirms that some dimeric phthalides undergo intramolecular cyclizations in basic media.
Method for the preparation of phytoprogestogenic extracts from rhizoma ligusticum chuanxiong and uses thereof
申请人:Yong Leong Eu
公开号:US20060068045A1
公开(公告)日:2006-03-30
A method of extracting phytoprogestogenic compounds from herbs and their use in preparing a medicament for treating humans requiring progesterone replacement or supplement. Assay systems to quantify progesterone and progestogenic receptor activity and a method for assembling a kit for the assays are also provided.
Enantiomeric Derivatives of Tokinolide B: Absolute Configuration and Biological Properties
作者:Alejandra León、J. Antonio Cogordán、Olov Sterner、Guillermo Delgado
DOI:10.1021/np200645p
日期:2012.5.25
The enantiomeric lactams (-)-8, (+)-8, (+)-9, and (-)-9 were formed by the reaction of the dimeric phthalide rac-tokinolide B (rac-3) with (R)-(+)-alpha-methylbenzylamine and (S)-(-)-alpha-methylbenzylamine. The absolute configurations of compounds 8 and 9 were assigned by experimental and theoretically calculated electronic circular dichroism methods for (+)-8 and (-)-9. Compounds 3, 5, (-)-8, (+)-8, (+)-9, and (-)-9 displayed cytotoxic activity toward several human tumor cell lines, with (-)-8 and (-)-9 being the most potent.