Triethylamine → 4-{2-Methoxy-4-[5-(6-methoxy-pyridin-3-yl)-imidazo[2,1-b][1,3,4]thiadiazol-2-yl]-phenoxy}-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-[4-(5-iodo-imidazo[2,1-b][1,3,4]thiadiazol-2-yl)-2-methoxy-phenoxy]-piperidine-1-carboxylic acid tert-butyl ester (94 mg, 0.169 mmol, 1 eq), 2-methoxy-5-pyridineboronic acid (39 mg, 0.253 mmol, 1.5 eq), EtOH (5 ml), Et3N (0.070 ml, 0.507 mmol, 3 eq) and Pd(PPh3)2Cl2 (12 mg, 0.0169 mmol, 0.1 eq) was heated under microwave irradiation (120° C., 30 min). The solvents were removed under reduced pressure and the residue was treated with Et2O. The filtrate was evaporated and the residue was purified by HPLC to give the desired product (12 mg; 13%) as a colourless oil. HPLC-MS (5-100% B in 8 min at 0.8 mL): tR=3.30 min, [M+H]+ m/z 538.3; 1H NMR (300 MHz, CD3COCD3) δ 8.87 (m, 1H), 8.28 (dd, J=8.7, 2.5 Hz, 1H), 7.64 (s, 1H), 7.59 (d, J=2.1 Hz, 1H), 7.54 (dd, J=8.4, 2.2 Hz, 1H), 7.24 (d, J=8.4 Hz, 1H), 6.89 (dd, J=8.7, 0.7 Hz, 1H), 4.71 (m, 1H), 3.96 (s, 3H), 3.93 (s, 3H), 3.75 (m, 2H), 3.32 (m, 2H), 1.98 (m, 2H), 1.70 (m, 2H), 1.45 (s, 9H).

Provenance & Evidence