Diastereoselective Synthesis of 2,3,4,5,6-Pentafluoroheptanes
作者:Daniel Farran、Alexandra M. Z. Slawin、Peer Kirsch、David O’Hagan
DOI:10.1021/jo901360e
日期:2009.9.18
A stereocontrolled synthesis of alkanes containing five contiguous fluorine atoms is presented. The compounds were prepared by sequential fluorination of diastereoisomeric alcohol-diepoxides. The chemistry involved epoxide ring-opening with HF-NEt3 and deshydroxyfluorination reactions of free alcohols with Deoxo-Fluor, The fluorination reactions were all highly stereospecific, with all five fluorines being incorporated in three sequential steps. Three different diastereoisomers of the 2,3,4,5,6-pentafluoroheptyl motif were prepared as heptane-1,7-diol derivatives, a structural format amenable for incorporation of the vicinal pentafluoro scaffold into larger molecular architectures.
Total Synthesis of (+)-Amphidinolide A. Assembly of the Fragments
作者:Barry M. Trost、Stephen T. Wrobleski、John D. Chisholm、Paul E. Harrington、Michael Jung
DOI:10.1021/ja0533646
日期:2005.10.1
The structure elucidation of (+)-amphidinolide A, a cytotoxic macrolide, has been accomplished by employing a combination of totalsynthesis and NMR spectroscopic analysis. Amphidinolide A possesses two skipped 1,4-diene subunits which are accessible by ruthenium-catalyzed alkene-alkyne couplings. Previous total syntheses had revealed that the reported structure was incorrect; therefore, to incorporate