Borane → [5'-Isopropyl-2'-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methanol

関与物質

反応手順

A solution of borane in THF (1 M, 859 μL, 0.859 mmol) was added dropwise to a stirred solution of 5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-carboxylic acid and 5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-carboxamide (3:1, 96.8 mg, 0.286 mmol) in dry THF at room temperature under N2. The reaction was stirred at room temperature for 3 h and carefully quenched with water (10 mL). The mixture was extracted with EtOAc (3×20 mL) and the combined extracts were washed with brine, dried (Na2SO4) and concentrated in vacuo to give the crude product. This was purified by flash chromatography (Si, 125×160 mm, 0-30% EtOAc in hexanes gradient) to afford [5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methanol as a colorless oil. Rf=0.27 (10% EtOAc/hexanes). 1H NMR (CDCl3, 500 MHz) δ 7.89 (br s, 1H), 7.62 (dd, J=8.0, 1.3 Hz, 1H), 7.36 (d, J=8.0 Hz, 1H), 7.29 (dd, J=8.5, 2.3 Hz, 1H), 7.03 (d, J=2.3 Hz, 1H), 6.96 (d, J=8.5, 1H), 4.51 (m, 2H), 3.74 (s, 3H), 2.93 (septet, J=7.0 Hz, 1H), 2.51 (s, 1H), 1.29 (d, J=7.0 Hz, 6H).

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