Potassium Carbonate → Gdc-0326

Participants

Reaction Steps

2-(2-Isopropyl-2H-[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulen-8-ol 490 (100 mg, 0.32 mmol), methanesulfonic acid (R)-1-carbamoyl-ethyl ester (64 mg, 0.38 mmol) and potassium carbonate (67 mg, 0.48 mmol) were suspended in DMF (3 mL) and the reaction mixture stirred at RT for 24 h then at 50° C. for 16 h. The reaction mixture was diluted with water (15 mL) and extracted with ethyl acetate (3×10 mL). The combined organic extracts were washed with brine, dried (MgSO4) and concentrated in vacuo. The resultant residue was subjected flash chromatography (SiO2 gradient 0-10% methanol in ethyl acetate) to yield 436 as a white solid (59 mg, 48%). LCMS: RT=3.07 min; [M+H]+=383; 1H NMR (400 MHz, d6-DMSO) 8.26 (1H, d, J=8.6 Hz), 7.81 (1H, s), 7.85 (1H, s), 7.51 (1H, s), 7.21 (1H, s), 6.72 (1H, dd, J=8.6, 2.6 Hz), 6.49 (1H, d, J=2.6 Hz), 5.85 (1H, sept, J=6.6 Hz), 4.62 (1H, q, J=6.6 Hz), 4.55-4.36 (4H, m), 1.47-1.36 (9H, m). ee>99% (chiralpak IC, 1 mL/min, 20% ethanol in heptane, 50 min run)

Provenance & Evidence