2-Ethyl-1-butanol → {1-[5-bromo-2-(2-ethyl-butoxy)-benzyl]-5-methyl-1H-pyrazol-4-yl}-acetic acid ethyl ester

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A solution of [1-(5-Bromo-2-hydroxy-benzyl)-5-methyl-1H-pyrazol-4-yl]-acetic acid ethyl ester, 2, (0.18 g g 0.51 mmol), triphenylphosphine (0.26 g, 1.02 mmol), di-tert-butylazodicarboxylate (0.23 g, 1.02 mmol) and 2-ethylbutan-1-ol (0.116 ml, 1.02 mmol) in a mixture of THF (1 mL) and toluene (2 ml) was at 120° C. on microwave for 20 min. The volatiles were removed in vacuo. The crude product was purified on silica to yield {1-[5-bromo-2-(2-ethyl-butoxy)-benzyl]-5-methyl-1H-pyrazol-4-yl}-acetic acid ethyl ester, 3.

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