Potassium Carbonate → 6-Fluoro-5-(4-(1-hydroxycyclobutyl)phenyl)-1H-indole-3-carbaldehyde

Participants

Reaction Steps

A mixture of 5-bromo-6-fluoro-1H-indole-3-carbaldehyde (90 mg, 0.37 mmol), 1-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)cyclobutanol (120 mg, 0.44 mmol), 2N aqueous potassium carbonate (0.75 mL, 1.49 mmol) in toluene (3.0 mL) and EtOH (1.0 mL) was degassed with N2 for 3 minutes, and treated with [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (30.0 mg, 0.041 mmol). The mixture was subjected to microwave irradiation conditions at 110° C. for 2 hours. The reaction mixture was cooled to room temperature, poured into half-saturated aqueous NH4Cl solution (15 mL) and extracted with EtOAc (6×15 mL). The combined organic layer were washed with brine, dried over MgSO4 and concentrated in vacuo. The crude material was purified by flash chromatography (9-50% EtOAc/petroleum ether) to afford the title compound (58.0 mg, 51% yield) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 10.0 (s, 1H), 8.42 (s, 1H), 8.20 (d, J=8.00 Hz, 1H), 7.66 (d, J=8.40 Hz, 2H), 7.59 (d, J=8.40 Hz, 2H), 7.50 (d, J=10.80 Hz, 1H), 2.48 (m, 2H), 2.41 (m, 2H), 2.02 (m, 1H), 1.76 (m, 1H).

Provenance & Evidence