反应详情

Diisopropylazo dicarboxylate (63 μL, 0.32 mmol) was added dropwise to a stirring mixture of methyl 4-(3-chloro-5-(cyclohexyloxy)-4-hydroxybenzamido)benzoate (7) (65 mg, 161 μmol), cyclohexanol (34 μL, 0.32 mmol) and triphenylphosphine (84 mg, 0.32 mmol) in THF (2 mL) and the resulting yellow mixture was stirred at RT for 20 h. The reaction was quenched with MeOH (5 mL) and the solvent was removed in vacuo. The residue was purified by silica gel chromatography (40 g, 0-15% EtOAc in iso-hexane) to give the desired methyl 4-(3-chloro-4,5-bis(cyclohexyloxy)benzamido)benzoate (8) (80 mg, 100%): m/z 486 [M+H]+ (ES+); 1H NMR (400-MHz, DMSO-d6) δ: 10.48 (1H, s), 7.97 (2H, d), 7.91 (2H, d), 7.67 (1H, d), 7.53 (1H, d), 4.53 (1H, m), 4.36 (1H, m), 3.84 (3H, m), 1.92 (4H, m), 1.80-1.70 (4H, m), 1.60-1.40 (6H, m), 1.30-1.05 (6H, m).

1. customThe reaction was quenched with MeOH (5 mL)
2. customthe solvent was removed in vacuo
3. customThe residue was purified by silica gel chromatography (40 g, 0-15% EtOAc in iso-hexane)