Stereochemical Elucidation of the Pentacyclopropane Antifungal Agent FR-900848
摘要:
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.
Total Synthesis of the Pentacyclopropane Antifungal Agent FR-900848
作者:Anthony G. M. Barrett、Krista Kasdorf
DOI:10.1021/ja960964j
日期:1996.11.13
Quatercyclopropane 31 was oxidized, homologated, reduced, and monocyclopropanated to provide the pentacyclopropane alcohol 35. Subsequent deoxygenation of alcohol 35 was effected using N-(phenylthio)succinimide (24) and tributylphosphine followed by Raney nickel desulfurization and deprotection to produce the alcohol 3. This was oxidized, homologated, and hydrolyzed to provide the fatty acid 2. BOP-Cl-mediated