Trifluoroacetic acid → 2-{4-Fluoro-4-[2-(2-isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulen-8-yl]-piperidin-1-yl}-N,N-dimethyl-acetamide

Participants

Reaction Steps

To a solution of 4-fluoro-4-[2-(2-isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulen-8-yl]-piperidine-1-carboxylic acid tert-butyl ester (45 mg, 88 μmol) in DCM (2.5 mL) was added TFA (0.8 mL) and the reaction mixture stirred at RT for 1 h before being concentrated in vacuo. The residue was dissolved in DCM (2 mL) and triethylamine (88 μL, 0.61 mmol), tetrabutylammonimum iodide (8 mg, 21 μmol) and 2-chloro-N,N-dimethyl-acetamide (14 μL, 0.1 mmol) added. The reaction mixture was stirred at RT for 16 h then diluted with DCM (20 mL) and washed with saturated aqueous sodium bicarbonate solution. The aqueous layer was extracted with DCM (3×5 mL) and the combined organic extracts were dried (MgSO4), filtered and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2 20% ethyl acetate in DCM then 2% MeOH in DCM) producing impure material. The material was subjected to flash chromatography (Si—NH2 eluting with DCM) to yield 523. LCMS: RT=3.43 min, [M+H]+=499 [ad823805] 1H NMR 400 MHz (d6-DMSO) δ: 8.37 (1H, d, J=8.4 Hz), 7.96 (1H, s), 7.18 (1H, dd, J=1.8, 8.4 Hz), 7.09 (1H, d, J=1.8 Hz), 5.93 (1H, sept, J=6.6 Hz), 4.37 (2H, t, J=5.1 Hz), 3.42 (2H, t, J=5.1 Hz), 3.30 (2H, s), 3.09 (3H, s), 2.93 (3H, s), 2.92-2.85 (2H, m), 2.55-2.46 (2H, m), 2.31-2.11 (2H, m), 1.97-1.87 (2H, m), 1.59 (6H, d, J=6.6 Hz)

Provenance & Evidence