反应详情

A solution of diisopropylazodicarboxylate (0.96 mL, 4.89 mmol) in dry THF (35 mL) was added drop-wise, under nitrogen, over 2 h (using a syringe pump) to a solution of ethyl (4-hydroxy-2-methylphenoxy)acetate (735 mg, 3.50 mmol), 1-(6-bromo-2-pyridinyl)-2-(ethyloxy)ethanol (860 mg, 3.49 mmol) and triphenylphosphine (1.28 g, 4.88 mmol) in dry THF (35 mL) at 0° C. The resulting mixture was stirred under nitrogen and gradually allowed to warm to room temperature over 21 h. The solvent was then removed in vacuo and the residue purified by SPE (silica, 2×50 g cartridge), eluting with cyclohexane:EtOAc (gradient 20:1 to 1:1) to afford the title compound as an oil (966 mg).

1. customThe solvent was then removed in vacuo
2. customthe residue purified by SPE (silica, 2×50 g cartridge)
3. washeluting with cyclohexane