反应详情

To a solution of 2-(2,4-Dichloro-benzoyl)-6-m-tolyl-benzofuran-3-carboxylic acid ethyl ester from step 5 (91.3 mg, 0.20 mmol, 1 eq) in MeOH/H2O/THF (2 mL, ratio:1:1:1) solution was added potassium hydroxide (72.0 mg, 0.52 mmol, 2.6 eq). The reaction mixture was stirred at rt for 6 h. 2N HCl (500 uL) was added to the reaction mixture and the solvent was removed under reduced pressure. The residue was purified by pre-HPLC to afford an yellow solid (68 mg, 80%) as desired product. 1H-NMR (CDCl3): δ 8.58 (d, J=8.3 Hz, 1H), 7.75 (dd, J=1.5, 8.3 Hz, 1H), 7.69 (s, 1H), 7.57 (d, J=1.5 Hz, 1H), 7.56 (d, J=8.3 Hz, 1H), 7.46 (dd, J=1.5, 8.3 Hz, 1H), 7.43 (m, 2H), 7.34 (t, 1H), 7.21 (d, J=8.3 Hz, 1H), 2.43 (s, 3H); LC-MS (MH+=425/427).

1. customthe solvent was removed under reduced pressure
2. customThe residue was purified by pre-HPLC