Trifluoroacetic acid → HCID 86699775, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-[1-(2,2-diethoxyethyl)-1H-pyrazol-3-yl]-5-fluoropyridine obtained in Reference Example 12 (4.0 g, 14.3 mmol) in CHCl3 (72 mL), TFA (6.4 mL, 85.9 mmol) was added, and the resulting mixture was stirred for 6 hours at 35° C. TFA (6.4 mL, 85.9 mmol) was further added thereto, and the mixture was stirred for 3 hours at 35° C. The reaction mixture was allowed to cool to room temperature, then an aqueous solution of NaHCO3 was added to the reaction mixture, followed by extraction with CHCl3. The organic layer was washed with a saturated aqueous solution of sodium chloride, dried over MgSO4, and then the drying agent was filtered off. The solvent was distilled off under reduced pressure to obtain [3-(5-fluoropyridin-2-yl)-1H-pyrazol-1-yl]acetaldehyde (colorless oil). To a solution of [3-(5-fluoropyridin-2-yl)-1H-pyrazol-1-yl]acetaldehyde in CHCl3 (36 mL), activated molecular sieve 4 A (29 g) and 2-aminoethanol (1.1 mL, 14.3 mmol) were added, and the resulting mixture was stirred for 48 hours at room temperature. The molecular sieve 4 A was filtered off through Celite®, and then the solvent was distilled off under reduced pressure to obtain a colorless oil. To a solution of the obtained colorless oil (0.10 g, 0.40 mmol) and 2-(2H-1,2,3-triazol-2-yl)benzoic acid (76 mg, 0.40 mmol) in DMF (0.4 mL), DIPEA (0.21 mL, 1.2 mmol) and HATU (0.16 g, 0.48 mmol) were added, and the resulting mixture was stirred for 48 hours at room temperature. The reaction mixture was purified by HPLC to obtain the title compound (40.8 mg) (colorless solid).

Provenance & Evidence