Aluminium lithium hydride → 4-chloro-1-(difluoromethyl)-1H-pyrazole-3-carbaldehyde

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Reaction Steps

To a solution of 4-chloro-1-difluoromethyl-1H-pyrazole-3-carboxylic acid methoxy-methyl-amide (164 mg, 0.68 mmol) in tetrahydrofuran (5 ml) was added at 0° C. a solution of lithium aluminiumhydride (1M in tetrahydrofuran, 0.35 ml) and stirring was continued for 30 minutes. The mixture was quenched at −15° C. with a saturated aqueous solution of potassium hydrogensulphate and extracted with diethyl ether. The organic layer was dried, evaporated and the residue purified by chromatography on silica gel using cyclohexane/ethyl acetate (4:1) as the eluent to give the title compound (71 mg) as a pale yellow oil.

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