Synthesis of bath enantiomers of 2-bromohexadecanoic acid is described by diastereoselective bromination of esters (+)- and (-)-3 followed by removal of the chiral auxiliary. The absolute configuration of the acids is confirmed by an independent chemical synthesis from chiral pool precursors.
A practical preparation of enantiomerically pure (R)- and (S)-2-bromohexadecanoic acids
作者:Jinsong Guo、David W Knapp、Stephanie Boegeman
DOI:10.1016/s0957-4166(00)00388-8
日期:2000.10
preparation of enantiomerically pure (R)- and (S)-2-bromohexadecanoic acids with e.e.>95% through resolution with the use of a recoverable chiral auxiliary is described. The procedure involves three reactions: Steglich esterification, DIBAL reduction, and Sharpless oxidation. The assessment of the enantiomeric purity is based on NMR analysis by using (1R,2R)-(+)-diphenylethane-1,2-diamine as a chiral