Potassium Carbonate → 5-(3-Chloro-phenyl)-3,3-diethyl-1,3-dihydro-indol-2-one

Beteiligte Stoffe

Reaktionsschritte

A solution of 5-bromo-1,3-dihydro-3,3-diethyl-[2H]-indol-2-one (2.7 g, 10 mmol), 3-chlorophenylboronic acid (1.6 g, 10 mmol), potassium carbonate (4 g, 30 mmol) and tetrakis(triphenylphosphine)palladium(0) (0.5 g, 0.4 mmol) in dimethoxyethane (100 ml), ethanol (25 ml), and water (25 ml) was heated to reflux for 6 hours. After cooling to room temperature, the mixture was diluted with water and extracted with EtOAc (2×). The combined organic extracts were washed with water, then brine, dried (MgSO4) and evaporated. The residue was purified by column chromatography (SiO2, EtOAc:hexane 1:3) to afford 5-(3-chloro-phenyl)-3,3-diethyl-1,3-dihydro-indol-2-one compound (0.8 g, 27%), m.p. 195–197° C.; 1H-NMR (DMSO-d6) δ 7.70 (t, 1H, J=2 Hz), 7.62–7.60 (m, 1H), 7.58 (d, 1H, J=1.7 Hz), 7.52 (dd, 1H, J=8.1, 2 Hz), 7.43 (t, 1H, J=7.9 Hz), 7.36–7.33 (m, 1H), 6.90 (d, 1H, J=8.1 Hz), 1.87–1.70 (m, 4H) and 0.52 (t, 6H, J=7.4 Hz); MS (+)APCI) m/z 300/302 (M−H).

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