Potassium Carbonate → 3-{[5'-Isopropyl-2'-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methyl}-6-phenyl-1,3-oxazinan-2-one

Participants

Reaction Steps

A mixture of 3-[2-iodo-5-(trifluoromethyl)benzyl]-6-phenyl-1,3-oxazinan-2-one (Intermediate 1, 51 mg, 0.11 mmol), 2-methoxy-5-isopropylphenyl boronic acid (86 mg, 0.11 mmol), potassium carbonate (76 mg, 0.55 mmol) and palladium acetate (7.4 mg, 0.011 mmol) in acetone (5 mL) and H2O (1 mL) was degassed and heated at reflux under N2 for 1 h. The reaction mixture was concentrated, diluted with water (10 mL) and extracted with EtOAc (3×20 mL). The combined extracts were dried (Na2SO4) and concentrated in vacuo to give the crude product. This was purified by flash chromatography on silica gel (0-20% EtOAc in hexanes gradient) to afford 3-{[5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]methyl}-6-phenyl-1,3-oxazinan-2-one as a colorless solid. LCMS=484.2 (M+1)+. 1H NMR present (500 MHz, CDCl3): δ 7.69 (br d, J=3.5 Hz, 1H), 7.62 (br d, J=8.0 Hz, 1H), 7.41-7.30 (m, 5H), 7.28 (d, J=2.5 Hz, 1H), 7.26 (d, J=2.5 Hz, 1H), 7.02 (d, J=2.3 Hz, 1H), 6.92 (d, J=8.5 Hz, 1H), 5.24 (dd, J=9.6, 2.5 Hz, 1H), 4.68 (d, J=3.2 Hz, 1H), 4.59 (d, J=15.5 Hz, 1H), 3.81 (s, 3H), 3.18-3.04 (m, 1H), 3.04-2.88 (m, 2H), 2.11 (m, 1H), 2.02 (m, 1H), 1.12 (d, J=7.1 Hz, 6H). The racemic material was separated by chiral HPLC using 15% IPA/heptane and an AD column.

Provenance & Evidence