Iodoethane → 4-(2-Ethoxy-naphthalen-1-ylmethyl)-1-[4(1-ethoxy-propyl)-2,6-dimethylphenyl]-3,5-diethyl-1H-pyrazole

Participants

Reaction Steps

Sodium hydride (60% mineral oil dispersion, 0.031 g, 0.78 mmol) was added portionwise to a solution of 1-{4-[4-(2-ethoxy-naphthalen-1-ylmethyl)-3,5-diethyl-pyrazol-1-yl]-3,5-dimethylphenyl}-propan-1-ol (0.123 g, 0.26 mmol) in 0.5 ml anhydrous tetrahydrofuran. After stirring 5 minutes, iodoethane (0.104 ml, 1.3 mmol) was added and the resulting mixture was stirred for 16 hours at ambient temperature. A second portion of sodium hydride (0.031 g of a 60% sodium hydride mineral oil dispersion; 0.78 mmol) was added, followed by a second portion of iodoethane (0.104 ml, 1.3 mmol). After stirring at ambient temperature for 4 hours, the reaction mixture was well-mixed with methylene chloride/aqueous sodium bicarbonate (10 ml of each). The aqueous phase was then twice extracted with 10 ml portions of fresh methylene chloride. The combined organic extracts were then dried over anhydrous sodium sulfate and concentrated in vacuo to afford a 190 mg residue. Flash chromatography of the entire sample (silica gel, 40 micron mesh; elution with ethyl acetate/hexanes=1:4 in volume) afforded the title compound (45 mg) as an oil.

Provenance & Evidence