Imidazole → Tert-butyl{[4'-fluoro-5'-isopropyl-2'-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methoxy}dimethylsilane

Participants

Reaction Steps

tert-Butyldimethylsilyl chloride (0.48 g, 3.21 mmol) and imidazole (0.50 g, 7.30 mmol) were added successively to a stirred solution of [4′-fluoro-5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methanol (1.00 g, 2.93 mmol) in dry CH2Cl2 (13.4 mL) at room temperature under N2 and the reaction was stirred overnight. Water (50 mL) was added and the mixture was extracted with EtOAc (3×50 mL). The combined extracts were dried (MgSO4) and concentrated in vacuo to give the crude product. This was purified by flash chromatography (Si, 25×160 mm, 1% EtOAc in hexanes) to afford tert-butyl {[4′-fluoro-5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methoxy}dimethylsilane as a colorless oil. Rf=0.16 (1% EtOAc in hexanes). LCMS calc.=457.2; found=457.2 (M+1)+. 1H NMR (500 MHz, CDCl3) δ 7.94 (s, 1H), 7.57 (d, J=7.8 Hz, 1H), 7.29 (d, J=7.6 Hz, 1H), 7.00 (d, J=8.6 Hz, 1H), 6.69 (d, J=12.1 Hz, 1H), 4.63 (br s, 1H), 4.50 (br s, 1H), 3.75 (s, 3H), 3.29-3.21 (m, 1H), 1.28 (d, J=6.9 Hz, 6H), 0.93 (s, 9H), 0.03 (s, 6H).

Provenance & Evidence