Sodium Hydroxide → 2-(4-(2-(1-isopropyl-1H-1,2,4-triazol-5-yl)-5,6-dihydrobenzo[f]imidazo[1,2-d][1,4]oxazepin-9-yl)piperidin-1-yl)-N,2-dimethylpropanamide

Participants

Reaction Steps

A biphasic mixture of 50% aqueous sodium hydroxide (2 mL) and DCM (2.5 mL) was treated with 2-bromo-2,N-dimethyl-propionamide (121 mg, 0.67 mmol), tetrabutylammonium bromide (118 mg, 0.37 mmol) and a solution of 2-(2-isopropyl-2H-[1,2,4]triazol-3-yl)-8-piperidin-4-yl-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene trifluoroacetic acid salt (300 mg, 0.61 mmol) in DCM (1 mL). The resultant mixture was stirred at RT for 3 h before the addition of further tetrabutylammonium bromide (118 mg, 0.37 mmol) and stirring at RT for 18 h. The reaction mixture was diluted with DCM and washed with water. The combined aqueous extracts were washed with DCM and the combined organic extracts dried (MgSO4), filtered and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, gradient 0 to 5% MeOH in DCM) followed by trituration in diethyl ether to give 248 as a cream solid (120 mg, 41%). 1H NMR δ (ppm) (DMSO-d6): 8.27 (1 H, d, J=8.26 Hz), 7.86 (1 H, d, J=0.63 Hz), 7.85 (1 H, s), 7.64 (1 H, m), 7.02 (1 H, dd, J=8.34, 1.75 Hz), 6.91 (1 H, d, J=1.70 Hz), 5.88-5.78 (1 H, m), 4.48-4.42 (4 H, m), 2.74 (2 H, d, J=10.86 Hz), 2.59 (3 H, d, J=4.75 Hz), 2.17-2.08 (2 H, m), 1.75-1.69 (4 H, m), 1.43 (6 H, d, J=6.60 Hz), 1.05 (6 H, s). 1 Proton obscured by solvent peak. LCMS: RT=2.78 min, M+H+=478

Provenance & Evidence