Synthesis and absolute configuration of the antiparasitic furanosesquiterpenes (-)-furodysin and (-)-furodysinin. Camphor as a six-membered ring chiral pool template
作者:Valerie Vaillancourt、Mohamad R. Agharahimi、Uma N. Sundram、Olivier Richou、D. John Faulkner、Kim F. Albizati
DOI:10.1021/jo00001a069
日期:1991.1
The syntheses of (-)-furodysin ((-)-2a) and (-)-furodysinin ((-)-3a) in four steps starting from (+)-9-bromocamphor (18) has been accomplished, thus establishing the absolute configuration of these and related metabolites. This was made possible by the unexpected exo selectivity in the aldol condensation of camphor-like enolates with aldehydes. This has been found to be a general phenomenon in the camphor system. Further, anionic fragmentation of the C1-C7 bond of camphor derivatives has allowed access to synthetic intermediates containing functionalized six-membered rings, thus opening up avenues from camphor to a new class of chiral pool elements not currently available from chiral pool substances.