A mixture of 2-(2-isopropyl-5-methyl-2H-[1,2,4]triazol-3-yl)-8-piperidin-4-yl-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene hydrochloride (120 mg, 0.28 mmol) in DMF (1.5 mL) was treated with potassium carbonate (97 mg, 0.7 mmol) followed by bromo acetamide (43 mg, 0.336 mmol) and stirred at RT for 18 h. The reaction mixture was diluted with ethyl acetate/methanol and washed with water, the organic layer dried (Na2SO4), filtered and concentrated in vacuo. The resultant solid residue was recrystallised from methanol to give 250 as a white solid (51 mg, 41%). 1H NMR δ (ppm) (DMSO-d6): 8.27 (1 H, d, J=8.28 Hz), 7.81 (1 H, s), 7.16 (1 H, s), 7.07 (1 H, s), 7.01 (1 H, dd, J=8.36, 1.78 Hz), 6.87 (1 H, d, J=1.72 Hz), 5.81-5.73 (1 H, m), 4.45-4.41 (4 H, m), 2.89-2.82 (2 H, m), 2.83 (2 H, s), 2.20 (3 H, s), 2.16-2.07 (2 H, m), 1.72-1.66 (4 H, m), 1.40 (6 H, d, J=6.61 Hz). 1 Proton obscured by solvent peak. LCMS: RT=2.97 [M+H]+=450
