Carbon dioxide methanol → Methyl((3S,4S)-1-(3-amino-2-chloro-5-cyanophenyl)-3-((tert-butyldimethylsilyl)oxy)piperidin-4-yl)carbamate

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Reaction Steps

(+/−)-methyl ((3R,4R)-1-(3-amino-2-chloro-5-cyanophenyl)-3-((tert-butyl dimethylsilyl)oxy) piperidin-4-yl)carbamate (Example 171E, 927 mg, 2.112 mmol) was separated by chiral SFC (Berger SFC MGIII, Column: Lux Cel-4 25×3 cm ID, 5 μm; Flow rate: 85.0 mL/min; Mobile Phase: 85/15 CO2/methanol; Detector Wavelength: 220 nm). Methyl ((3S,4S)-1-(3-amino-2-chloro-5-cyanophenyl)-3-((tert-butyldimethylsilyl)oxy)piperidin-4-yl)carbamate (406 mg) was obtained as a white foaming solid. The enantiomeric purity of each fraction was estimated to be greater than 99.5%.

Provenance & Evidence