Potassium Carbonate → HCID 69256517, compound

Participants

Reaction Conditions

Reaction Steps

Using Suzuki coupling methodology, 5-Bromo-2-{(2S,3R)-3-[(3S)-3-{[tert-butyl(dimethyl)silyl]oxy}-3-(4-fluorophenyl)propyl]-4-oxo-1-phenylazetidin-2-yl}phenyl acetate (100 mg, 0.16 mmol) was combined with 3-hydroxyphenyl boronic acid (29 mg, 0.21 mmol) with deoxygenated toluene (3 mL) and deoxygenated ethanol (1 mL). 2.0 M aqueous potassium carbonate (0.31 mL, 0.31 mmol) was added and the vessel was purged with nitrogen. Tetrakis(triphenylphosphine)palladium(0) (9 mg, 0.008 mmol) was added and the vessel purged again. The reaction was heated to 70° C. for 1.5 h, cooled, diluted with water and extracted with ethyl acetate (2×). The combined organic layers were washed with water, brine, dried over sodium sulfate, filtered, concentrated and purified by chromatography (40 g silica gel, 20% to 90% ethyl acetate-hexane) to afford 4-{(2S,3R)-3-[(3S)-3-{[tert-butyl(dimethyl)silyl]oxy}-3-(4-fluorophenyl)propyl]-4-oxo-1-phenylazetidin-2-yl}-3′-hydroxybiphenyl-3-yl acetate (70 mg, 69% yield)); Rf 0.34 (1:2 ethyl acetate-hexane); 1H NMR (300 MHz, CDCl3) δ 7.34-7.17 (m, 10H), 7.06-6.90 (m, 5H), 6.79 (ddd, J=8.1, 2.5, 0.8 Hz, 1H), 6.03 (br s, 1H), 4.67 (d, J=2.3 Hz, 1H), 4.64 (t, J=5.6 Hz, 1H), 3.26 (ddd, J=4.8, 2.5, 2.4 Hz, 1H), 2.27 (s, 3H), 1.94-1.73 (m, 4H), 0.84 (s, 9H), −0.02 (s, 3H), −0.19 (s, 3H) ppm; MS [M−OSi(CH3)2C(CH3)3]+ 508.0.

Provenance & Evidence