反应详情

To a stirred solution of 1.40 g (5.5 mmol) of acetic acid N′-(2-benzenesulfonyl-acetyl)-hydrazide in 50 mL of acetonitrile, 1.02 g (6.5 mmol, 1.2 eq) of phosphorus oxychloride were added, and the solution heated at reflux for 3 hours. The reaction mixture was diluted with water, extracted with EtOAc, the organic phase dried over Na2SO4, filtered and evaporated. Column chromatography on silica gel with EtOAc yielded 0.90 g (70%) of 2-benzenesulfonylmethyl-5-methyl-[1,3,4]oxadiazole as a white solid, MS: 239 (MH+).

1. temperaturethe solution heated
2. temperatureat reflux for 3 hours
3. extractionextracted with EtOAc
4. dry with materialthe organic phase dried over Na2SO4
5. filtrationfiltered
6. customevaporated