Methanol → 3-(1,1-Dimethoxy-methyl)-6-[2-methoxy4-(2-trimethylsilanyl-ethoxymethoxy)-phenyl]-1-(2-trimethylsilanyl-ethoxymethyl)-1H-indazole

Participants

Reaction Steps

3-(1,1-Dimethoxy-methyl)-6-iodo-1-(2-trimethylsilanyl-ethoxymethyl)-1H-indazole (1.06 g, 2.37 mmol), 2-methoxy-4-(trimethylsilanyl-ethoxymethoxy)-phenylboronic acid (0.99 g, 3.32 mmol), and sodium carbonate (352 mg, 1.4 mmol) were stirred in a mixture of benzene (15 mL), MeOH (3 mL), and water (1 mL) in a flask purged with argon. Tetrakis(triphenylphosphine)palladium(0) (220 mg, 0.19 mmol) was added, and the reaction stirred at reflux for 16 h. The reaction was allowed to cool and was diluted with ether (70 mL). Organics were washed with H2O and brine (30 mL each), dried (Na2SO4), and concentrated in vacuo. Purification by silica gel chromatography (15% EtOAc/hexanes) gave 1.12 g (82%) of 3-(1,1-dimethoxy-methyl)-6-[2-methoxy-4-(2-trimethylsilanyl-ethoxymethoxy)-phenyl]-1-(2-trimethylsilanyl-ethoxymethyl)-1H-indazole as a faintly yellow oil. 1H NMR (300 MHz, CDCl3) δ 7.91 (d, 1H, J=8.4 Hz), 7.64 (s, 1H), 7.37 (dd, 1H, J=8.4, 1.2 Hz), 7.29 (d, 1H, J=8.4 Hz), 6.71–6.77 (m, 2H), 5.82 (s, 1H), 5.75 (s, 2H), 5.28 (s, 2H), 3.77–3.83 (m, 5H), 3.57 (t, 2H, J=8.4 Hz), 3.46 (s, 6H), 1.00 (t, 2H, J=8.4 Hz), 0.88 (t, 2H, J=8.4 Hz), 0.03 (s, 9H), −0.05 (s, 9H).

Provenance & Evidence