Synthesis and Mass Spectral Data of four Potential Biomarkers Related to the C<sub>19</sub>Tricyclanes Found in Australian Oils and Puget Sound Sediments
作者:Teodoro S. Kaufman
DOI:10.1080/00397919508012684
日期:1995.4
The synthesis of four potential biomarkers, 13 alpha-, 13 beta-, 14 alpha- and 14 beta-ethyl-8 beta(H)-podocarpane is reported. GC-MS comparison with an Australian oil C-19 tricyclane and the mass spectra of two Puget Sound C-19-terpanes evidenced non-identity of the synthetic compounds with the natural products; thus, proposed structures should be revised.
Total Synthesis of the Labdane Diterpenes Galanal A and B from Geraniol
作者:Shih-Che Lin、Rong-Jie Chein
DOI:10.1021/acs.joc.6b02766
日期:2017.2.3
The first total synthesis of galanal A and B has been achieved from naturally occurring geraniol. Key steps in this synthesis are the use of a Lewis acid assisted chiral Brønsted acid (chiral LBA) mediated cationic polyene cyclization and a titanocene-mediated radical cyclization for the asymmetric assembly of the “AB” ring and the construction of the all-carbon quaternary center at the junction of