Ethylacetate heptane → (R)-N-((S)-1-(2-fluoro-4-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide

Temperature

0 °C

To a solution of (R,E)-N-(2-fluoro-4-(trifluoromethyl)benzylidene)-2-methylpropane-2-sulfinamide (7.3 g, 24.7 mmol) in CH2Cl2 (247 mL) cooled to 0° C. (water/ice bath) under nitrogen, was added 3M methyl magnesium bromide (33 mL, 99 mmol) in Et2O. Reaction mixture allowed to stir for 30 min at 0° C., then gradually allowed to warm to room temperature and stirred for 1 hour at room temperature. Reaction mixture was cooled to 0° C. then quenched with the slow addition of a saturated solution of NH4Cl. Aqueous mixture extracted with EtOAc. Organic phases combined, washed with water, brine, dried (Na2SO4), filtered and concentrated onto silica gel. Silica gel column chromatography (EtOAc/Heptane 40 to 100%) provided (R)—N—((S)-1-(2-fluoro-4-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide (4.68 g, 15.0 mmol, 61% yield) as a white crystalline solid. 1H NMR (400 MHz, CDCL3) δ 1.22 (s, 9H) 1.60 (d, J=6.80 Hz, 3H) 3.38 (d, J=4.01 Hz, 1H) 4.87-4.97 (m, 1H) 7.33 (d, J=10.32 Hz, 1H) 7.39-7.45 (m, 1H) 7.49-7.55 (m, 1H). LCMS m/z 312.0 (M+H)+, Rt 0.92 min.

1. customReaction mixture
2. temperatureto warm to room temperature
3. stirringstirred for 1 hour at room temperature
4. customReaction mixture
5. temperaturewas cooled to 0° C.
6. customthen quenched with the slow addition of a saturated solution of NH4Cl
7. extractionAqueous mixture extracted with EtOAc
8. washwashed with water, brine
9. dry with materialdried (Na2SO4)
10. filtrationfiltered
11. concentrationconcentrated onto silica gel

ORD record

ord-19ccfe62824147f69930b2b0ef4d7451

Source dataset

uspto-grants-2015_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08957068B2