反应详情

温度

155 °C

In nitrogen atmosphere at 0° C., 0.25 mL of ethanethiol was added to 3 mL of DMF dissolving 104 mg (2.6 mmol) of 60% sodium hydride. Adding 505 mg (1.3 mmol) of 4-t-butyl-5-(4-methoxy-2-phenylbenzo[d]oxazol-6-yl)-3,3-dimethyl-2,3-dihydrofuran (Compound [62]), the mixture was refluxed for 1.0 hours at 155° C. The resulting mixture was poured in pure water and extracted with ethyl acetate. The organic layer was washed with saturated aqueous solution of sodium chloride, dried with magnesium sulfate anhydride, and concentrated. The concentrate was applied to a silica gel column and the elution was carried out with the mixture of hexane and ethyl acetate (hexane:ethyl acetate=5:1) to obtain 410 mg of 4-t-butyl-5-(4-hydroxy-2-phenylbenzo[d]oxazol-6-yl)-3,3-dimethyl-2,3-dihydrofuran (Compound [63]). Yield 82.8%.

1. extractionextracted with ethyl acetate
2. washThe organic layer was washed with saturated aqueous solution of sodium chloride
3. dry with materialdried with magnesium sulfate anhydride
4. concentrationconcentrated
5. washthe elution
6. additionwas carried out with the mixture of hexane and ethyl acetate (hexane:ethyl acetate=5:1)