Pyrazole → HCID 63811257, compound

To a solution of pyrazole (1.00 g, 14.7 mmol) in of dimethylformamide (10 mL) was added sodium hydride (60% oil dispersion, 450 mg, 11 mmol). After 5 min, bromomethylcyclohexane (2.4 mL, 17 mmol) was added by syringe and the mixture was maintained overnight. The reaction mixture was quenched with methanol, diluted with water, and extracted with ether (2×). The combined organic layers were dried over magnessium sulfate and concentrated in vacuo. The residue was purified by chromatography (95/5 hexanes/ethyl acetate) to provide 500 mg (27%) of 1-cyclohexylmethyl-1H-pyrazole. To a solution of 1-cyclohexylmethyl-1H-pyrazole (490 mg, 3.00 mmol) in tetrahydrofuran (10 mL) at −78° C. was added a 2.5 M solution of n-butyllithium in hexanes (1.5 mL, 3.8 mmol). The reaction mixture was maintained at −78° C. for 1 h and was treated with dimethylformamide (1.0 mL, 13 mmol). The reaction mixture was allowed to warm to rt, maintained overnight, and was quenched with methanol. The reaction mixture was diluted with water and was extracted with ether (2×). The combined organic layers were dried over magnessium sulfate and concentrated in vacuo. The residue was purified by chromatography (95/5 hexanes/ethyl acetate) to provide 390 mg (68%) of 2-cyclohexylmethyl-2H-pyrazole-3-carbaldehyde.

1. temperaturethe mixture was maintained overnight
2. customThe reaction mixture was quenched with methanol
3. additiondiluted with water
4. extractionextracted with ether (2×)
5. dry with materialThe combined organic layers were dried over magnessium sulfate
6. concentrationconcentrated in vacuo
7. customThe residue was purified by chromatography (95/5 hexanes/ethyl acetate)

ORD record

ord-a78165eaafb24f75b5a0b719cd668307

Source dataset

uspto-grants-2007_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07244745B2