Cesium carbonate → HCID 69269583, compound

Participants

Reaction Steps

To a clear, light brown solution of 2-bromo-6-methoxy-4-(2-trimethylsilanyl-ethoxymethoxy)-quinoline-2-carboxylic acid methyl ester (1.01 g, 2.28 mmol), N-methylhomopiperazine (0.32 mL, 2.57 mmol), and 4 Å sieves in 30 mL anhydrous toluene was added Pd2 (dba)2 (43.8 mg, 0.048 mmol) and BINAP (169.8 mg, 0.27 mmol). The resulting wine colored solution was treated with cesium carbonate (1.124 g, 3.45 mmol). The reaction mixture was heated at reflux under nitrogen for 21 hours. The pea green reaction mixture was cooled to room temperature and concentrated. The crude mixture was purified by flash chromatography on silica gel using a gradient of 95:5 to 40:60 methylene chloride: methanol to afford the desired product as a yellow foam (1.004 g, 92%). 1H NMR (300 MHz, DMSO, d6) δ 7.67 (s, 1 H, ArH3), 6.94 (d, 1 H, Jm=2.4 Hz, ArH5), 6.66 (d, 1 H, Jm=2.4 Hz, ArH7), 5.60 (s, 2 H, OCH2O), 3.94 (s, 3 H, CO2CH3), 3.88 (s, 3 H, OCH3), 3.82 (t, 2 H, J=8.0 Hz, OCH2CH2Si), 3.75 (bs, 4 H, ArNCH2CH2CH2NCH3 & ArNCH2CH2N—CH3), 3.45 (bs, 2 H, ArNCH2CH2NCH3), 3.31 (bs, 2 H; ArNCH2CH2CH2NCH3), 2.83 (s, 3 H, NCH3), 2.28 (bs, 2 H ArNCH2CH2 CH2NCH3), 0.92 (t, 2 H, J=8.0 Hz, OCH2CH2Si), −0.04 (s, 9 H, Si(C H3)3; Mass Spec.: calc. for [C24H37N3O5Si+H]+ Theor. m/z=476; Obs. 476.

Provenance & Evidence