反应详情

温度

80 °C

To a 25 mL round bottom flask under a nitrogen atmosphere were charged 0.77 g (2.17 mmol) of toluene-4-sulfonic acid 2-(5-methyl-2-phenyloxazol-4-yl)ethyl ester, and 0.5 g (1.97 mmol) of 2-(4-hydroxy-2-hydroxymethylphenoxy)-2-methylpropionic acid ethyl ester dissolved in 10 mL of absolute ethanol. Next, 0.54 g (3.94 mmol) of potassium carbonate (325 mesh) was added and the reaction was heated to 80° C. for 12 h. The volatiles were removed in vacuo and the crude residue was dissolved in 75 mL EtOAc and washed twice with brine, dried over Na2SO4, and removed in vacuo to give a crude oil. This crude residue was purified using radial chromatography with a 2 mm normal phase silica gel plate, eluting with a step gradient of 5:95 EtOAc:Hex to 35:65 EtOAc:Hex to give a colorless oil (0.17 g, 20%). MS (ES) m/e 452 (M+1).

1. customThe volatiles were removed in vacuo
2. dissolutionthe crude residue was dissolved in 75 mL EtOAc
3. washwashed twice with brine
4. dry with materialdried over Na2SO4
5. customremoved in vacuo
6. customto give a crude oil
7. customThis crude residue was purified
8. washeluting with a step gradient of 5:95 EtOAc