Trifluoroacetic acid → 2-(2-Isopropyl-5-methoxymethyl-2H-[1,2,4]triazol-3-yl)-8-piperidin-4-yl-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene trifluoroacetate salt

To a solution of 4-[2-(2-isopropyl-5-methoxymethyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulen-8-yl]-piperidine-1-carboxylic acid tert-butyl ester (158 mg, 0.30 mmol) in DCM (1.5 mL) was added trifluoroacetic acid (1.5 mL, 20.2 mmol) and the reaction mixture stirred at RT for 30 min. The reaction mixture was concentrated in vacuo and the residue azeotroped with ether. The resultant oil was triturated with diethyl ether to give 2-(2-Isopropyl-5-methoxymethyl-2H-[1,2,4]triazol-3-yl)-8-piperidin-4-yl-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene trifluoroacetate salt as a solid which was collected by filtration (103 mg, 64%). LCMS RT=3.03 min, [M+H]+=423. 1H NMR 400 MHz (DMSO-d) δ: 8.56 (1 H, s), 8.33 (1 H, d, J=8.33 Hz), 7.90 (1 H, s), 7.00 (1 H, dd, J=8.38, 1.78 Hz), 6.85 (1 H, d, J=1.73 Hz), 5.81-5.80 (1 H, m), 4.46 (4 H, d, J=2.51 Hz), 4.33 (2 H, s), 3.34 (2 H, d, J=12.58 Hz), 3.27 (3 H, s), 2.98-2.95 (2 H, m), 2.82 (1 H, t, J=11.91 Hz), 1.93 (2 H, d, J=13.66 Hz), 1.75 (2 H, t, J=12.95 Hz), 1.44 (6 H, d, J=6.60 Hz)