反应详情

A solution of 3-(4-(1,3-dioxolan-2-yl)phenyl)-5-(1-(pyridin-2-yl)-5-(trifluoromethyl)-1H-pyrazol-4-yl)-1,2,4-oxadiazole (25 g, 58.2 mmol) and con. HCl (500 mL) in THF/water (500 mL/500 mL) was stirred at RT for 3 hours. Upon completion of the reaction, as monitored by TLC, the reaction mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed with water and brine and then dried and concentrated under reduced pressure to afford 4-(5-(1-(pyridin-2-yl)-5-(trifluoromethyl)-1H-pyrazol-4-yl)-1,2,4-oxadiazol-3-yl)benzaldehyde (19 g, 49 mmol). The compound had an HPLC retention time=1.90 min.—CHROMOLITH® SpeedROD 4.6×30 mm. flow=5 mL/min (2 min. gradient); Solvent A=10% MeOH, 90% H2O, 0.1% TFA; Solvent B=90% MeOH, 10% H2O, 0.1% TFA. LC/MS M+1=386.2.

1. customUpon completion of the reaction
2. extractionextracted with ethyl acetate
3. washThe organic layer was washed with water and brine
4. customdried
5. concentrationconcentrated under reduced pressure