Lithium aluminum hydride → 2-ethyl-5-(4-fluoro-benzylamino)-2H-pyrazole-3-carbaldehyde

Participants

Reaction Steps

To 2-ethyl-5-(4-fluoro-benzylamino)-2H-pyrazole-3-carboxylic acid methyl ester (529, 1.00 g, 3.61 mol) in tetrahydrofuran (70.0 mL) under an atmosphere of nitrogen at room temperature, lithium tetrahydroaluminate (1.00 M of in tetrahydrofuran, 10.00 mL) was slowly added. The reaction was stirred at room temperature overnight, followed by slowly adding sodium sulfate decahydrate (15.0 g). After 2 hours, the reaction was filtered, concentrated and purified with silica gel column chromatography eluting with 20% to 100% ethyl acetate in hexane to give a yellow oil (530, 0.16 g, 18%). MS (ESI) [M+H+]+=248.2.

Provenance & Evidence