Iodine → (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-iodo-5-(trifluoromethoxy)benzyl]-4-methyl-1,3-oxazolidin-2-one

To a solution of (4S,5R)-3-[2-amino-5-(trifluoromethoxy)benzyl]-5-[3,5-bis(trifluoromethyl)phenyl]-4-methyl-1,3-oxazolidin-2-one (582 mg, 1.16 mmol) in CHCl3 (35 mL) was added t-butyl nitrite (275 μL, 2.32 mmol). After 10 minutes, I2 (736 mg, 2.9 mmol) was added. The reaction was stirred at room temperature for 30 minutes, and then heated to 65° C. for 2 hours. The reaction was then cooled to room temperature, diluted with EtOAc (150 mL) and washed with aqueous NaHSO3, water, brine, saturated NaHCO3, and brine (50 mL each). The organic layer was dried over Na2SO4, filtered, and concentrated. Purification of the residue by flash chromatography on silica gel (2 to 15% EtOAc/hexanes) afforded (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-iodo-5-(trifluoromethoxy)benzyl]-4-methyl-1,3-oxazolidin-2-one. Rf=0.30 (15% EtOAc/hexanes). LCMS=614.1 (M+1)+. 1H NMR (CDCl3, 500 MHz) δ 7.89-7.91 (m, 2H), 7.79 (s, 2H), 7.23 (m, 1H), 6.95 (m, 1H), 5.75 (d, J=8.0 Hz, 1H), 4.81 (d, J=15.8 Hz, 1H), 4.32 (d, J=15.8 Hz, 1H), 4.07 (m, 1H), 0.78 (d, J=6.6 Hz, 3H).

1. temperatureheated to 65° C. for 2 hours
2. temperatureThe reaction was then cooled to room temperature
3. washwashed with aqueous NaHSO3, water, brine, saturated NaHCO3, and brine (50 mL each)
4. dry with materialThe organic layer was dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customPurification of the residue by flash chromatography on silica gel (2 to 15% EtOAc/hexanes)

ORD-Eintrag

ord-758408f541a1403c87d35d7cbcacf110

Quelldatensatz

uspto-grants-2014_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08735435B2