Potassium Phosphate, Tribasic → (3S)-1-[(2S,3S)-2-Amino-3-[4-([1,2,4]triazolo[4,3-alpha]pyridin-6-yl)phenyl]-1-oxobutanyl]-3-fluoropyrrolidine

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of the product (48.0 mg, 0.195 mmol) from Step B in 0.75 mL of ethylene glycol dimethyl ether and 0.75 mL of water was added 62.0 mg (0.13 mmol) of (3S)-1-[(2S,3S)-2-[(tert-butoxycarbonyl)amino]-3-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]-1-oxobutanyl]-3-fluoropyrrolidine from Example 10, Step B, 1,1′-bis(diphenylphosphino)ferrocene palladium(II) chloride (21.0 mg, 0.26 mmol) and potassium phosphate (83 mg, 0.39 mmol). The reaction mixture was heated at 90° C. for 16 h, and then allowed to cool to room temperature. The mixture was diluted with ethyl acetate, and the solution was washed sequentially with water and saturated aqueous brine, dried (magnesium sulfate), and concentrated under reduced pressure in vacuo to yield the crude coupled product, which was purified by preparative thin layer chromatography (silica gel, 5% methanol/dichloromethane eluant). The resultant product was dissolved in 1 mL of dichloromethane and was treated with 1 mL of trifluoroacetic acid. The reaction was stirred at room temperature for 1 h, and was then concentrated under reduced pressure. The residue was purified by preparative thin layer chromatography (silica gel, 10% methanol/1% ammonium hydroxide/dichloromethane eluant) to afford the title compound. LC/MS 368.2 (M+1).

Provenance & Evidence