Potassium Carbonate → 7-Chloro-8-fluoro-4-methyl-2-phenylquinoline

Participants

Reaction Conditions

Reaction Steps

4-Bromo-7-chloro-8-fluoro-2-phenylquinoline (1.1 g, 03.3 mmol), methane boronic acid (196 mg, 3.27 mmol), potassium carbonate (1.4 g, 9.8 mmol) and 1,4-dioxane (4 mL) were combined and stirred in a 10 mL R.B. flask. The flask was subjected to 3 vacuum-argon cycles. Tetrakis(triphenylphosphine)palladium(0) (380 mg, 0.33 mmol) was added, and the reaction was again subjected to 3 vacuum argon-cycles. The reaction was heated at 108° C. (external temperature) for 27 h, at which point the reaction was allowed to cool, and was diluted with ethyl acetate (30 mL), and water (30 mL). The layers were separated, and the aqueous layer extracted with ethyl acetate (30 mL). The organics were combined, dried over sodium carbonate, and concentrated in vacuo. The residue was chromatographed on silica gel, eluting with hexanes:methylene chloride 2:1. This afforded the title compound as a white solid; 1H NMR (CDCl3, 400 MHz) δ 2.75 (s, 3H), 7.47-7.55 (m, 4H), 7.69-7.72 (dd, 1H, J=8.9 & 1.6 Hz), 7.77 (s, 1H), 8.18-8.21 (m, 2H); MS(APCI+): 272.07 (100) [MH+], 274.03 (30) [(M+2)H+]; HPLC tR=3.80 min (OpenLynx, nonpolar—5 min).

Provenance & Evidence