Sodium Hydroxide → 5-Trifluoromethyl-1-[(3-fluorophenyl)methyl]-1H-pyrrolo[2,3-b]pyridine-2-carboxylic acid

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Reaction Steps

A solution of 3.15 g (8.6 mmol) of 5-trifluoromethyl-1-[(3-fluorophenyl)methyl]-1H-pyrrolo[2,3-b]pyridine-2-ethyl carboxylate obtained in Stage 1.2 in 100 mL of ethanol and of 26 mL of 2N sodium hydroxide is stirred for four hours under reflux. After this time, the reaction mixture is concentrated at reduced pressure, and then is taken up in 40 mL of water. The reaction mixture is acidified to pH 3 by successive additions of 1N hydrochloric acid. The precipitate is collected by filtration, washed with water and then dried at reduced pressure. Thus, 2.9 g of the expected product is isolated in the form of a white powder, which is used as it is in the next stage.

Provenance & Evidence