Acetaldehyde → (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(ethylamino)-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 (80 mg, 0.159 mmol) in dichloroethane (1.6 mL) was added acetaldehyde (9 μL, 0.159 mmol) and NaBH(OAc)3 (67 mg, 0.318 mmol). The reaction was stirred at room temperature, and after 30 minutes acetaldehyde (4.5 μL, 0.80 mmol) was added. After an hour, additional acetaldehyde (4.5 μL, 0.80 mmol) was added. After an additional hour, the reaction was diluted with EtOAc (20 ml) and washed with saturated NH4Cl solution and brine (10 mL each). The organic layer was dried over Na2SO4, filtered, and concentrated. Purification of the residue by flash chromatography on silica gel (10 to 20% EtOAc/hexanes) afforded (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-(ethylamino)-5-(trifluoromethoxy)benzyl]-4-methyl-1,3-oxazolidin-2-one. Rf=0.66 (25% EtOAc/hexanes). LCMS=531.2 (M+1)+. 1H NMR (CDCl3, 500 MHz), 7.88 (s, 1H), 7.73 (s, 2H), 7.10 (dd, J=2.1, 8.8 Hz, 1H), 6.90 (d, J=2.4 Hz, 1H), 6.59 (d, J=8.9 Hz, 1H), 5.66 (d, J=8.4 Hz, 1H), 4.81 (s, 1H), 4.70 (d, J=15.4 Hz, 1H), 4.08 (d, J=15.4 Hz, 1H), 4.06-4.00 (m, 1H), 3.20-3.13 (m, 2H), 1.32 (t, J=7.1 Hz, 3H), 0.78 (d, J=6.6 Hz, 3H).

1. waitAfter an hour
2. waitAfter an additional hour
3. washwashed with saturated NH4Cl solution and brine (10 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 (10 to 20% EtOAc/hexanes)

ORD 기록

ord-8a8eb390b47149d5ab942cf1050b4274

출처 데이터셋

uspto-grants-2010_08

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US07781426B2