Sodium Carbonate → HCID 86692493, compound

Participants

Reaction Steps

To 1-(5-bromo-2-chloropyridin-3-yl)-5-methyl-1H-pyrazole-4-carboxylic acid ethyl ester (2 g) in Reference Example 29 (1), cyclopropylboronic acid (724 mg), tetrakis(triphenylphosphine)palladium (0) (670 mg) and 2 M sodium carbonate aqueous solution (8.7 ml) was added tetrahydrofuran (12 ml), and stirred under reflux. After completion of the reaction, a saturated aqueous solution of ammonium chloride was added to the reaction solution under ice-cooling, and extracted with chloroform. The organic layer was dried over anhydrous sodium sulfate, and the solvent was evaporated in vacuo. The obtained residue was purified with silica gel chromatography (n-hexane/ethyl acetate) to give 1-(2-chloro-5-cyclopropylpyridin-3-yl)-5-methyl-1H-pyrazole-4-carboxylic acid ethyl ester (1.13 g) as a white solid. MS (ESI) m/z: 306 (M+H)+.

Provenance & Evidence