Hydrochloric Acid → 3-(4-Methylphenyl)prop-2-yn-1-ol

Temperature

55 °C

To a degassed solution of 4-bromotoluene (4.27 g, 25 mmol) in tetrahydrofuran (30 mL) was added in the following order: copper(I) iodide (143 mg, 0.75 mol), 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 20 h. This mixture was then cooled to ambient temperature, diluted with ether (150 mL) and water (50 mL) and acidified with 5% hydrochloric acid. The ethereal layer was separated and the aqueous layer was extracted with ether (3×30 mL). The combined organic portions were washed with 5% hydrochloric acid (2×30 mL), saturated aqueous solution of sodium hydrogen carbonate (2×30 mL), dried with anhydrous magnesium sulfate and evaporated in vacuo. The residue was purified by flash column chromatography (silica gel Fluka 60, chloroform) affording 3-(4-methylphenyl)prop-2-yn-1-ol as oil.

1. customThe resulting mixture was degassed one more time
2. temperaturecooled in an ice bath
3. temperatureThis mixture was then cooled to ambient temperature
4. customThe ethereal layer was separated
5. extractionthe aqueous layer was extracted with ether (3×30 mL)
6. washThe combined organic portions were washed with 5% hydrochloric acid (2×30 mL), saturated aqueous solution of sodium hydrogen carbonate (2×30 mL)
7. dry with materialdried with anhydrous magnesium sulfate
8. customevaporated in vacuo
9. customThe residue was purified by flash column chromatography (silica gel Fluka 60, chloroform)

ORD record

ord-267397fba22e4269989ff4c0ab26507b

Source dataset

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08551993B2