Propargyl alcohol → 3-(4-(Trifluoromethyl)phenyl)prop-2-yn-1-ol

Temperature

55 °C

To a degassed solution of 1-bromo-4-trifluoromethylbenzene (5.62 g, 25 mmol) in tetrahydrofuran (25 ml) was added in the following order: copper(I) iodide (143 mg, 0.75 mL), tetrakis(triphenylphosphine)palladium (0.85 g, 7.5 mmol), and 1,8-diazabicyclo[5.4.0]undec-7-ene (4.55 g, 30 mmol). The resulting mixture was degassed one more time, cooled in an ice bath and a solution of propargyl alcohol (1.68 g, 30 mmol) in tetrahydrofuran (5 mL) was added over period of 10 min. The reaction mixture was slowly heated up to 55° C. and then stirred at this temperature for 3 h and then at ambient temperature overnight. The mixture was diluted with diethyl ether (100 mL), washed with water (50 mL), 5% hydrochloric acid (35 mL) and saturated aqueous solution of sodium hydrogen carbonate (30 mL). The organic solution was dried with anhydrous magnesium sulfate and evaporated in vacuo. The residue was purified by column chromatography (silica gel Fluka 60, dichloromethane) affording 3-(4-trifluoromethylphenyl)prop-2-yn-1-ol.

1. customThe resulting mixture was degassed one more time
2. temperaturecooled in an ice bath
3. customat ambient temperature
4. customovernight
5. washwashed with water (50 mL), 5% hydrochloric acid (35 mL) and saturated aqueous solution of sodium hydrogen carbonate (30 mL)
6. dry with materialThe organic solution was dried with anhydrous magnesium sulfate
7. customevaporated in vacuo
8. customThe residue was purified by column chromatography (silica gel Fluka 60, dichloromethane)

ORD record

ord-3f028cdf0f044b7e8d7beb0d9ee3760f

Source dataset

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08551993B2