Triethylamine → 2-(1-isopropyl-1H-1,2,4-triazol-5-yl)-N-(isoxazol-3-yl)-4,5-dihydrobenzo[b]pyrazolo[1,5-d][1,4]oxazepine-9-carboxamide

Participants

Reaction Steps

To an ice-cooled suspension of 2-(2-isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,10b-diaza-benzo[e]azulene-9-carboxylic acid (0.15 g, 0.44 mmol) in DCM (3.5 mL) was added oxalyl chloride (79 L, 0.93 mmol) and DMF (25 L) and the mixture stirred at RT for 2 h. 3-Amino-isoxazole (185 mg, 2.2 mmol) and triethylamine (0.12 mL, 0.88 mmol) were added and the mixture stirred at RT for 18 h before the addition of saturated aqueous sodium hydrogen carbonate. The resultant mixture was extracted with DCM then 5% MeOH in DCM and the combined extracts dried (Na2SO4), filtered and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, gradient 0 to 10% MeOH in DCM) followed by trituration in diethyl ether to give 126 as a white solid. 1H NMR (CDCl3, 400 MHz): δ 9.49 (s, 1 H); 8.65 (d, J=2.3 Hz, 1 H); 8.30 (d, J=1.8 Hz, 1 H); 7.96 (d, J=0.7 Hz, 1 H); 7.86 (dd, J=8.5, 2.3 Hz, 1 H); 7.30 (d, J=8.5 Hz, 1 H); 7.23 (d, J=1.8 Hz, 1 H); 6.88 (s, 1 H); 5.72-5.59 (m, 1 H); 4.61 (t, J=5.6 Hz, 2 H); 3.25 (t, J=5.6 Hz, 2 H); 1.58 (d, J=6.6 Hz, 6 H). LCMS: RT=10.24 min, M+H+=406

Provenance & Evidence