Carbon Tetrachloride → 1-(Chloromethyl)-4-(ethylsulfonyl)benzene

Triphenylphosphine (12.77 g, 481 mmol), carbon tetrachloride (19.0 mL, 197 mmol) and tetrahydrofuran (40 mL) were combined and stirred at room temperature for 15 minutes. A solution of (4-ethanesulfonyl-phenyl)-methanol (4.87 g, 24.4 mmol) in 45 mL tetrahydrofuran was added, then the reaction mixture was heated at 75° C. for 3 hours. The reaction mixture was cooled to room temperature, then partitioned between ethyl acetate (100 mL) and water (100 mL). The organic phase was dried over MgSO4, filtered, and concentrated to give the crude product as an oily solid. A solution of this crude product and dichloromethane was evaporated over silica gel, and the resulting silica gel supported crude product was loaded onto an Analogix SuperFlash™ column. Flash chromatography (15%-35% ethyl acetate in hexanes) afforded 5.16 g (97%) of 4-(ethanesulfonyl)benzyl chloride as a white, crystalline solid. 1H NMR (300 MHz, DMSO-d6) δ ppm 7.88 (d, J=8.2 Hz, 2 H), 7.70 (d, J=8.2 Hz, 2 H), 4.86 (s, 2 H), 3.29 (q, J=7.4 Hz, 2 H), 1.07 (t, J=7.4 Hz, 3 H).

1. temperaturethe reaction mixture was heated at 75° C. for 3 hours
2. temperatureThe reaction mixture was cooled to room temperature
3. custompartitioned between ethyl acetate (100 mL) and water (100 mL)
4. dry with materialThe organic phase was dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customto give the crude product as an oily solid
8. customA solution of this crude product and dichloromethane was evaporated over silica gel

ORD-Eintrag

ord-48a7f18ce5ef4bf990cdfcbce77216ff

Quelldatensatz

uspto-grants-2012_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08124629B2