Approaches to the assembly of the antifungal agent FR-900848: studies on the synthesis of C 2 symmetric tetracyclopropane derivatives and an X-ray crystallographic study of (1R,3S,4S,6R)-bicyclopropyl-1,6-di-{2-[(4R,5R)-di-(isopropyloxycarbonyl)-1,3-dioxolane]}
作者:Anthony G. M. Barrett、Wendel W. Doubleday、Krista Kasdorf、Gary J. Tustin、Andrew J. P. White、David J. Williams
DOI:10.1039/c39950000407
日期:——
Two sequential asymmetric bicyclopropanation reactions were used to prepare (1R,3S,4R,6S,7S,9R,10S,12R)-quatercyclopropyl-1,12-dimethanol and (1S,3R,4R,6S,7S,9R,10R,12S)-quatercyclopropyl-1,12-dimethanol.
Iterative Cyclopropanation: A Concise Strategy for the Total Synthesis of the Hexacyclopropane Cholesteryl Ester Transfer Protein Inhibitor U-106305
作者:Anthony G. M. Barrett、Dieter Hamprecht、Andrew J. P. White、David J. Williams
DOI:10.1021/ja9708326
日期:1997.9.1
The first enantioselective totalsynthesis of the hexacyclopropane natural product U-106305, which is produced by Streptomyces sp. UC 11136, is described in full detail. Considerations on the biosynthesis of U-106305 and its close resemblance to the pentacyclopropane bacterial metabolite FR-900848 (10) led to the proposal that its previously unknown stereostructure should be represented as 11. The
Determination of the full structure and absolute stereochemistry of the antifungal agent FR-900848: an X-ray crystallographic study of (1R,3S,4R,6S,7S,9R,10S,12R)-quatercyclopropyl-1,12-dimethanediyl di-4-bromobenzoate
作者:Anthony G. M. Barrett、Krista Kasdorf、Gary J. Tustin、David J. Williams
DOI:10.1039/c39950001143
日期:——
Degradation studies and partial synthesis are used to establish the full structure and absolute stereochemistry of the nucleoside antifungal agent FR-900848.
Stereochemical Elucidation of the Pentacyclopropane Antifungal Agent FR-900848
作者:Anthony G. M. Barrett、Wendel W. Doubleday、Krista Kasdorf、Gary J. Tustin
DOI:10.1021/jo960054k
日期:1996.1.1
Full structural elucidation of FR-900848, an antifungal pentacyclopropane nucleoside natural product from Streptoverticillium fervens, is reported. A series of model compounds were prepared using multiple asymmetric Simmons-Smith cyclopropanation reactions. Comparisons of spectroscopic data of synthetic alkenes 9 and 10, quatercyclopropanes 11 and 12, and imidazolidines 13 and 14 with FR-900848 and its degradation products 2, 3, and 4 were consistent with the full structural assignment of the natural product as structure 7.