反应详情

温度

100 °C

To a solution of 2-bromothiazole (265 μL, 2.97 mmol), tert-butyl 2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy)acetate (1.19 g, 3.56 mmol), KCl (664.7 mg, 8.91 mmol) in a 4:1 mixture of toluene (20 mL)/EtOH (5 mL) was added an aqueous solution of Na2CO3 2M (11.8 mL). The flask was evacuated and re-filled with nitrogen three times and then, tetrakis(triphenylphosphine)palladium (0) (346.2 mg, 0.30 mmol) was added. The reaction mixture was heated to 100° C. for 4 h. When the reaction was completed, inorganic solids were removed by filtration through Celite® and washing with several portions of dichloromethane, then the solvent was evaporated. The residue was absorbed onto silica then subjected to flash chromatography (SiO2, hexane: ethyl acetate (AcOEt), 9:1) to afford 825.2 mg of de tert-butyl 2-(4-(thiazol-2-yl)phenoxy)acetate as a white solid (95% yield). RMN1H (CDCl3, 400 MHz): δ 7.95-7.86; (m, 2H), 7.81; (d, J=3.3 Hz, 1H), 6.99-6.85; (m, 1H), 4.57; (s, 2H), 1.49; (s, 1H) ppm.

1. customThe flask was evacuated
2. additionre-filled with nitrogen three times
3. custominorganic solids were removed by filtration through Celite®
4. washwashing with several portions of dichloromethane
5. customthe solvent was evaporated
6. customThe residue was absorbed onto silica