2-Isopropoxy-6-(tributylstannyl)pyridine → 5-(3-(6-isopropoxypyridin-2-yl)-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,2,4-thiadiazol-3-amine

Participants

Reaction Conditions

Reaction Steps

A solution of 5-(3-iodo-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,2,4-thiadiazol-3-amine (0.8 g, 1.29 mmol) and 2-isopropoxy-6-(tributylstannyl)pyridine (0.83 g, 1.95 mmol) in DMF (8 mL) was bubbled with Argon for 15 min. To the above mixture was added CuI (0.124 g, 0.65 mmol) and Pd(PPh3)4 (0.15 g, 0.13 mmol) and argon gas was purged for another 15 min. The reaction was heated at 90° C. for 1 h. The mixture was treated with ice cold water (20 mL) to obtain off white precipitate. The precipitate was filtered, washed with H2O (20 mL) and dried. The solid was purified by basic alumina chromatography (eluent: 20% EtOAc in petroleum ether) to give 5-(3-(6-isopropoxypyridin-2-yl)-1-tosyl-1H-indol-5-yl)-N-(4-methoxybenzyl)-1,2,4-thiadiazol-3-amine (0.35 g, 43%) as a white solid. MS (ESI, pos. ion) m/z: 625.2 (M+1); 1H-NMR (400 MHz, CDCl3): δ 9.02 (d, J=1.2 Hz, 1H), 8.10-8.08 (m, 2H), 7.96 (dd, J=8.8, 2.0 Hz, 1H), 7.83 (d, J=8.4 Hz, 2H), 7.64 (t, J=8.0 Hz, 1H), 7.34-7.24 (m, 2H) 4.62 (d, J=5.6 Hz, 2H), 3.80 (s, 3H), 2.35 (s, 3H), 1.46 (d, J=5.6 Hz, 6H).

Provenance & Evidence