Cesium carbonate → US9718822, 45 Diastereomer 1

Participants

Reaction Conditions

Reaction Steps

A mixture of N-((S)-3-chloro-2-hydroxypropyl)-5-(4,4-difluoro-2-(5-fluoro-2-hydroxyphenyl)pyrrolidin-1-yl)pyrazolo[1,5-a]pyrimidine-3-carboxamide (0.060 g, 0.128 mmol) and Cs2CO3 (0.208 g, 0.639 mmol) in DMF (6.4 mL) was heated at 85° C. for 30 minutes. The reaction mixture was cooled to ambient temperature and filtered. The filtrate was concentrated under reduced pressure to give the crude material which was purified by silica gel flash column chromatography (CH2Cl2 to NH4OH:MeOH:CH2Cl2=0.5:5:95) to afford a mixture of the diastereomers. The isolated diastereomers were further purified by chiral column chromatography (Chiral Tech OD-H column, 20% EtOH in hexanes). Fractions having a retention time of about 17.1 minutes were isolated to afford the title compound designated as Diastereomer 1 (11 mg, 20% yield; MS (APCI) m/z=434.2 (M+H). Fractions having a retention time of about 21.0 minutes were isolated to provide the title compound designated as Diastereomer 2 (13 mg; 24% yield); MS (APCI) m/z=434.2 (M+H).

Provenance & Evidence