Potassium Hydroxide → 1-[2-[5-methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl]acetyl]-4-piperidinecarbonitrile

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of 3-methyl-5-trifluoromethylpyrazole (9.3 g, 62 mmol) and 45% aqueous potassium hydroxide solution (7.79 g, 62 mmol) in N,N-dimethylformamide (25 mL) was cooled to 5° C., and 1-(2-chloroacetyl)-4-piperidinecarbonitrile (i.e. the product of Example 8, Step A or A1) (11.2 g, 60 mmol) was added. The reaction mixture was stirred for 8 h at 5-10° C., then diluted with water (100 mL), and filtered. The filter cake was washed with water and dried at 50° C. in a vacuum-oven to give 15 g of the title compound as a solid containing 3% of its regioisomer, i.e. 1-[2-[3-methyl-5-(trifluoromethyl)-1H-pyrazol-1-yl]acetyl]-4-piperidinecarbonitrile.

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