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

Temperature

55 °C

To a degassed solution of 1-bromo-4-trifluoromethylbenzene (17.7 g, 78.6 mmol) in tetrahydrofuran (140 mL) was added in the following order: copper(I) iodide (447 mg, 2.35 mmol), bis(triphenylphosphine)palladium(II) dichloride (1.65 g, 2.35 mmol), and 1,8-diazabicyclo[5.4.0]undec-7-ene (14.4 g, 94.3 mmol). The resulting mixture was degassed one more time, cooled in an ice bath and a solution of propargyl alcohol (5.29 g, 94.3 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 subsequently at ambient temperature overnight. The mixture was diluted with ether (200 mL), washed with 5% hydrochloric acid (60 mL), water (3×50 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) yielding 3-(4-trifluoromethylphenyl)prop-2-yn-1-ol.

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

ORD record

ord-87e8537a98c74afc88d1aef5d5857960

Source dataset

uspto-grants-2011_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07943613B2