Potassium Iodide → 1-[5-Chloro-(4-chloro-benzyloxy)-benzyl]-5-methyl-1H-pyrazole-3-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-(5-Chloro-2-hydroxy-benzyl)-5-methyl-1H-pyrazole-3-carboxylic acid ethyl ester 2 (0.6 g, 2.0 mmol) in DMF (5 mL) were added potassium carbonate (0.84 g, 6.1 mmol), potassium iodide (0.34 g, 2.0 mmol) and 4-chlorobenzylbromide (0.38 g, 2.2 mmol). The resulting mixture was heated at 100° C. overnight. The mixture was poured into water (20 mL) and extracted with Et2O (3×15 mL). The organic layers were combined, washed with brine (30 mL), dried (Na2SO4) and the volatiles were removed in vacuo to give 0.56 g (71%) of 1-(2-Benzyloxy-5-chloro-benzyl)-5-methyl-1H-pyrazole-3-carboxylic acid ethyl ester 3 as a white solid.

Provenance & Evidence