Hydrochloric Acid → 3-{3-[6-(3-chlorobenzyl)-1-methyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyridin-7-yl]-1H-pyrazol-1-yl}propanoic acid

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Reaction Steps

6-(3-Chlorobenzyl)-1-methyl-7-(1H-pyrazol-5-yl)-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyridine (25 mg, 0.069 mmol, from Example 103, Step 5) in acetonitrile (0.90 mL) was treated with methyl acrylate (19 μL, 0.21 mmol, Aldrich) and 1,8-diazabicyclo[5.4.0]undec-7-ene (10. μL, 0.069 mmol, Aldrich) and stirred for 70 minutes. Purification via preparative HPLC-MS (Waters XBridge C18, eluting with a gradient of MeCN/H2O containing 0.15% NH4OH) followed by evaporation of eluent afforded methyl 3-(3-(6-(3-chlorobenzyl)-1-methyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyridin-7-yl)-1H-pyrazol-1-yl)propanoate. The ester intermediate was dissolved in THF (0.45 mL) and was treated with 1.0 M NaOH in water (0.45 mL, 0.45 mmol). After 25 minutes, the reaction was acidified to pH 3-4 by the addition of 1 N HCl. Water was added (3 mL), and the precipitated product was isolated by filtration and air dried. Yield: (21 mg, 70%).

Provenance & Evidence