反应详情

1.70 g (42.5 mmol) sodium hydride (60%) are added batchwise to a solution of 4.50 g (33.3 mmol) benzoxazol-2-one in 50 mL DMF, while the temperature is kept below 0° C. by cooling. After one hour's stirring a solution of 9.61 g (37.4 mmol) 1-iodo-4-methyl-4-nitro-pentane in 20 mL DMF is added dropwise so that the temperature does not exceed 5° C. The mixture is stirred overnight at ambient temperature and the solvent is distilled off. The residue is taken up in ethyl acetate and washed successively with water and sodium chloride solution, dried with sodium sulphate and evaporated down. 11.0 g oil are obtained. Mass spectroscopy: [M+H]+=265.

1. customis kept below 0° C.
2. temperatureby cooling
3. additionis added dropwise so that the temperature
4. customdoes not exceed 5° C
5. distillationthe solvent is distilled off
6. washwashed successively with water and sodium chloride solution
7. dry with materialdried with sodium sulphate
8. customevaporated down