Sodium hydride → 5-[3,5-Bis(trifluoromethyl)phenyl]-3-[2-iodo-5-(trifluoromethyl)benzyl]1,3-oxazolidin-2-one

A stirred suspension of sodium hydride (60% in oil, 167 mg, 4.18 mmol) in THF (5 mL) was treated at 0° C. with 5-[3,5-bis(trifluoromethyl)phenyl]-1,3-oxazolidin-2-one (500 mg, 1.67 mmol) dissolved in THF (1 mL), under an atmosphere of N2. The reaction was stirred for 20 min and a solution of 2-(bromomethyl)-1-iodo-4-(trifluoromethyl)benzene (610 mg, 1.67 mmol) in THF (1 mL) was added dropwise. The reaction was stirred at room temperature for 18 h. The reaction was quenched with H2O (1 mL) and partitioned between EtOAc (80 mL) and H2O (25 mL). The aqueous phase was re-extracted with EtOAc (2×20 mL) and the combined organic extracts were washed with brine (30 mL), dried (MgSO4) and concentrated in vacuo to give the crude product. This was purified by flash silica-gel chromatography (0-30% EtOAc in hexanes gradient) to afford 5-[3,5-bis(trifluoromethyl)phenyl]-3-[2-iodo-5-(trifluoromethyl)benzyl]1,3-oxazolidin-2-one. Rf=0.55 (515% EtOAc/hexanes). LCMS 584 (M+1)+. 1H NMR (CDCl3, 500 MHz) δ 8.05 (d, J=8.2 Hz, 1H), 7.95 (br s, 1H), 7.85 (br s, 2H), 7.51 (br s, 1H), 7.32 (m, 1H), 5.72 (t, J=8.0 Hz, 1H), 4.74 (d, J=15.5 Hz, 1H), 4.64 (d, J=15.3 Hz), 4.14 (t, J=7.1 Hz, 1H), 3.47 (dd, J=7.1, 1.6 Hz).

1. stirringThe reaction was stirred at room temperature for 18 h
2. customThe reaction was quenched with H2O (1 mL)
3. custompartitioned between EtOAc (80 mL) and H2O (25 mL)
4. extractionThe aqueous phase was re-extracted with EtOAc (2×20 mL)
5. washthe combined organic extracts were washed with brine (30 mL)
6. dry with materialdried (MgSO4)
7. concentrationconcentrated in vacuo
8. customto give the crude product
9. customThis was purified by flash silica-gel chromatography (0-30% EtOAc in hexanes gradient)

ORDレコード

ord-f9315acac83f4ec2b50a6b2d0030392b

出典データセット

uspto-grants-2010_01

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07652049B2