Potassium Carbonate → 2-{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 2-(2-isopropyl-2H-[1,2,4]triazol-3-yl)-8-piperidin-4-yl-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene 375 TFA salt (386 mg, 0.76 mmol) in THF (5 mL) was added potassium carbonate (210 mg, 1.52 mmol) followed by 2-chloro-N,N-dimethylacetamide (102 mg, 0.84 mmol). The reaction mixture was stirred for 65 hours before being diluted with DCM and water. The organic layer was dried over anhydrous magnesium sulfate and concentrated in vacuo. The resulting residue was purified by silica gel flash chromatography (SiO2, gradient 0-3% methanol in DCM) then freeze-dried from methanol and water to give 509 as a white solid (158 mg, 43%). LCMS: RT=3.33 min, [M+H]+=481. 1H NMR δ (ppm) (DMSO-d6): 8.27 (1H, d, J=8.20 Hz), 8.09 (1 H, d, J=0.59 Hz), 7.09 (1 H, dd, J=8.25, 1.83 Hz), 6.93 (1H, d, J=1.77 Hz), 5.83-5.81 (1H, m), 4.35 (2 H, t, J=5.02 Hz), 3.41 (2 H, t, J=5.05 Hz), 3.15 (2 H, s), 3.05 (3 H, s), 2.93 (2 H, d, J=10.95 Hz), 2.82 (3 H, s), 2.48-2.44 (1H, m), 2.16-2.13 (2 H, m), 1.81-1.70 (2 H, m), 1.66-1.64 (2 H, m), 1.54 (6 H, d, J=6.59 Hz)

Provenance & Evidence