Potassium Carbonate → HCID 86600748, compound

Participants

Reaction Conditions

Reaction Steps

(3R,4S)-4-(4-Bromo-2-{[tert-butyl(dimethyl)silyl]oxy}phenyl)-3-[(3S)-3-{[tert-butyl(dimethyl)silyl]oxy}-3-(4-fluorophenyl)propyl]-1-phenylazetidin-2-one (0.080 g, 0.11 mmol), crude dimethyl [3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]phosphonate (0.054 g total, 0.030 g calculated, 0.096 mmol) and aqueous 2 M potassium carbonate (0.12 mL, 0.24 mmol) were mixed in ethanol (1.0 mL) and toluene (3.0 mL). The solution was deoxygenated by bubbling nitrogen through the mixture for 5 min while stirring. Tetrakis(triphenylphosphine)palladium(0) (0.05 g) was added and the reaction was heated for 3 h at 70° C. under an atmosphere of nitrogen. The reaction was cooled to room temperature, diluted with ethyl acetate, washed with water and brine, dried over sodium sulfate and concentrated by rotary evaporation under reduced pressure. The product was purified by chromatography over silica gel using ethyl acetate-hexane (gradient: 10% ethyl acetate to 80%) to afford dimethyl (3′-{[tert-butyl(dimethyl)silyl]oxy}-4′-{(2S,3R)-3-[(3S)-3-{[tert-butyl(dimethyl)silyl]oxy}-3-(4-fluorophenyl)propyl]-4-oxo-1-phenylazetidin-2-yl}biphenyl-3-yl)phosphonate as a colorless syrup (0.065 g, 84%). 1H NMR (300 MHz, CDCl3) δ 6.9-8.0 (m, 16H), 5.09 (d, J=2.2 Hz, 1H), 4.64 (d, J=6.1 Hz, 1H), 3.79 (d, J=2.4 Hz, 3H), 3.76 (d, J=2.4 Hz, 3H), 3.05-3.15 (m, 1H), 1.8-2.0 (m, 4H), 1.06 (s, 9H), 0.85 (s, 9H), 0.36 (s, 3H), 0.33 (s, 3H), 0.00 (s, 3H), −0.20 (s, 3H) ppm

Provenance & Evidence