The invention relates to biocatalytic methods for preparing
enantiomerically pure stereoisomers of
1-(2,6-dichloro-3-fluorophenyl)ethanol. Disclosed are methods of
preparation of the desired (S)-enantiomer, which methods are based on a
combination of enzymatic resolution, chemical esterification and chemical
hydrolysis with inversion of 1-(2,6-dichloro-3-fluorophenyl)ethyl esters
or stereoselective bio-reduction of 2,6-dichloro-3-fluoro-acetophenone
with a biocatalyst such as an enzyme or a microorganism. The chiral
(S)-enantiomer can be used in the synthesis of certain enantiomerically
enriched, ether linked 2-aminopyridine compounds that potently inhibit
auto-phosphorylation of human heptocyte growth factor receptor.