Tetrahydrofuran → (R)-4-((R)-1-(6-(3,4-dimethoxyphenyl)pyrazolo[1,5-a]pyrazin-4-yloxy)ethyl)pyrrolidin-2-one

Participants

Reaction Steps

A solution of 1M sodium bis(trimethylsilyl) amide in THF (0.18 mL, 0.18 mmol) was added to a solution of (R)-4-((R)-1-hydroxyethyl)pyrrolidin-2-one 1.18 (22.9 mg, 0.18 mmol) in DMF (1 mL) at room temperature, forming a white precipitate. After 8 minutes, a solution of 4-chloro-6-(3,4-dimethoxyphenyl)pyrazolo[1,5-a]pyrazine 5.03 (34 mg, 0.12 mmol) in DMF (1.1 mL) was added under argon. Dark brown solution stirred at room temperature overnight. Mixture was quenched by addition of water, brine and ethyl acetate and layers were separated. Aqueous was extracted with ethyl acetate and combined organic layers were washed with 50% brine, dried (Na2SO4), filtered, and concentrated under reduced pressure. Resulting residue was purified by silica gel column chromatography (0-10% methanol in dichloromethane) to yield (R)-4-((R)-1-(6-(3,4-dimethoxyphenyl)pyrazolo[1,5-a]pyrazin-4-yloxy)ethyl)pyrrolidin-2-one 5.04.

Provenance & Evidence