(RS)-N-[1-(5-bromo-2-fluoro-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide → (S)-(-)-N-[1-(5-bromo-2-fluoro-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide

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Reaction Steps

A solution of (RS)-N-[1-(5-bromo-2-fluoro-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide (2.7 g) in dichloromethane was divided in 100 mg aliquots which were separated on chiral HPLC (Reprosil Chiral NR 8 μm, 250×30 mm, Dr. Maisch GmbH) using a 85:15-mixture of heptane and isopropanol as the eluent. The first eluting enantiomer (retention time: 9.94 min), the (S)-(−)-N-[1-(5-bromo-2-fluoro-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide, was obtained as a light yellow waxy solid (1.05 g, 39%), and the second eluting enantiomer (retention time: 12.92 min), the (R)-(+)-N-[1-(5-bromo-2-fluoro-phenyl)-2-hydroxy-1-methyl-ethyl]-2-chloro-acetamide, was also obtained as a light yellow waxy solid (1.07 g, 40%), with e.e. >99% each.

Provenance & Evidence