Dimethylformamide → HCID 85947686, compound

Temperature

-78 °C

To a solution of pyrazole (1.00 g, 14.7 mmol) in of dimethylformamide (10=L) 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 magnesium 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 x). The combined organic layers were died over magnesium 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. temperatureto warm to rt
2. temperaturemaintained overnight
3. customwas quenched with methanol
4. additionThe reaction mixture was diluted with water
5. extractionwas extracted with ether (2 x)
6. concentrationconcentrated in vacuo
7. customThe residue was purified by chromatography (95/5 hexanes/ethyl acetate)

ORD record

ord-c0ddf101e2f04e48bbc05f1eb98a5b52

Source dataset

uspto-grants-2010_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07700630B2