反应详情

In a round bottom flask wrapped with foil, methyl 4-hydroxy-3-(trifluoromethyl)benzoate (500 mg, 2.13 mmol) was dissolved in methylene chloride (10 mL). 4-Hydroxy-1-methyl-piperidine (0.25 mL, 2.13 mmol), PPh3 (670 mg, 2.56 mmol), and DIAD (0.50 mL, 2.56 mmol) were added thereto, and the mixture was stirred at room temperature for 23 hours. DTAD (4.26 mmol) and PPh3 (1.12 g, 4.26 mmol) were added at 0° C. to the reaction mixture, which was stirred at room temperature for 24 hours. The resulting mixture was concentrated and then purified by silica gel chromatography (Hex/EA=1/1→DCM/MeOH=10/1) to obtain the title compound (512 mg, 76%).

1. stirringwas stirred at room temperature for 24 hours
2. concentrationThe resulting mixture was concentrated
3. custompurified by silica gel chromatography (Hex/EA=1/1→DCM/MeOH=10/1)