4-Toluenesulfonyl chloride → ((1R,2S)-2-hydroxycyclohexyl)methyl 4-methylbenzenesulfonate

To a solution of (1S,2R)-2-(hydroxymethyl)cyclohexanol (0.44 g, 3.85 mmol) and N,N-dimethylaminopyridine (DMAP) (0.485 g, 3.97 mmol) in anhydrous CH2Cl2 (10 mL) was added a solution of p-toluenesulfonyl chloride (0.767 g, 4.02 mmol) in anhydrous CH2Cl2 (5 mL) under argon at room temperature. The reaction mixture was stirred at room temperature for 22 hrs and triethylamine (0.5 mL) was added. The mixture was stirred for additional 100 min, concentrated under reduced pressure, water was added and the product was extracted with EtOAc twice. Combined organic layers were washed with brine, concentrated under reduced pressure and purified by flash chromatography (20% to 70% EtOAc/hexanes gradient) to give ((1R,2S)-2-hydroxycyclohexyl)methyl 4-methylbenzenesulfonate as a colorless oil. Yield (0.732 g, 71%). 1H NMR (400 MHz, DMSO-d6) δ 7.72-7.76 (m, 2H), 7.42-7.47 (m, 2H), 4.60 (d, J=5.5 Hz, 1H), 4.12 (dd, J=3.1, 9.2 Hz, 1H), 3.90 (dd, J=7.2, 9.2 Hz, 1H), 3.00-3.10 (m, 1H), 2.40 (s, 3H), 1.73-1.80 (m, 1H), 1.46-1.65 (m, 3H), 1.34-1.42 (m, 1H), 0.85-1.16 (m, 4H).

1. stirringThe mixture was stirred for additional 100 min
2. concentrationconcentrated under reduced pressure, water
3. additionwas added
4. extractionthe product was extracted with EtOAc twice
5. washCombined organic layers were washed with brine
6. concentrationconcentrated under reduced pressure
7. custompurified by flash chromatography (20% to 70% EtOAc/hexanes gradient)

ORD record

ord-835e5ef593354bf39090aadad922c805

Source dataset

uspto-grants-2015_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08993807B2