Citric Acid → HCID 89635780, compound

Participants

Reaction Steps

1M aq. solution of LiOH.H2O (0.4 mL) was added to a stirred solution of ethyl 5-((2R,4R)-4-((tert-butyldimethylsilyl)oxy)-2-(2,5-difluorophenyl)pyrrolidin-1-yl)pyrazolo[1,5-a]pyridine-3-carboxylate (Isomer-I) (Int-60) (0.07 g, 0.14 mmol) in EtOH (5 mL) and the stirring was continued at 90° C. for 8 h. The reaction mixture was concentrated under reduced pressure to afford the crude product. The crude product thus obtained was diluted with cold water, acidified with citric acid solution, filtered the solid precipitated to afford 5-((2R,4R)-2-(2,5-difluorophenyl)-4-hydroxypyrrolidin-1-yl)pyrazolo[1,5-a]pyridine-3-carboxylic acid (Int-62) as yellow solid. MS (ESI): m/z 360 (M+H).

Provenance & Evidence