反应详情

温度

-40 °C

410 mg (1.0 mmol) of benzhydryl (E)-(2S,3S,5R)-3-(3-hydroxy- propenyl)-3-methyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylate were dissolved in 6 ml of methylene chloride, cooled to -40° C. and treated with 250 μl (1.5 mmol) of trifluoromethanesulfonic anhydride. After 5 minutes 200 μl (2.50 mmol) of pyridine were added, the mixture was stirred at the same temperature for a further hour and subsequently the cooling bath was removed. The solvent was removed on a rotary evaporator at room temperature, the reaction mixture was taken up in 20 ml of methylene chloride and washed twice with 10 ml of saturated sodium chloride solution each time. Drying over magnesium sulfate, filtration and concentration on a rotary evaporator were carried out. The residual red resin was oxidized without further purification. Yield: 600 mg (97%) of red resin MS: (M+) 471.6 IR (KBr): 1777, 1743, 1630, 1160, 987 cm-1

1. customsubsequently the cooling bath was removed
2. customThe solvent was removed on a rotary evaporator at room temperature
3. washwashed twice with 10 ml of saturated sodium chloride solution each time
4. dry with materialDrying over magnesium sulfate, filtration and concentration on a rotary evaporator
5. customThe residual red resin was oxidized without further purification