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]}
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]}
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.