反应详情

Under ice-cooling and stirring, 12 ml of an aqueous solution containing 632 mg of cis-4-acetoxymethyl-3-amino-2-oxoazetidine and 1.122 g of sodium hydrogen carbonate is added to a suspension of 2.36 of 2-(2-chloroacetamido-4-thiazolyl)-2-methoxyiminoacetyl chloride (syn-isomer) in 20 ml of tetrahydrofuran. The mixture is stirred for 2 hours at room temperature and the solvent is then distilled off in vacuo to leave the residue, which solidifies. Water is added to the solidified residue, followed by filtration. The collected crystals are washed successively with an aqueous sodium hydrogen carbonate solution, water and ether and dried to give cis-4-acetoxymethyl-3-[2-(2-chloroacetamido-4-thiazolyl)-2-methoxyiminoacetamido]-2-oxoazetidine (syn-isomer), m.p. 180°-190° C. (dec.).

1. temperatureUnder ice-cooling
2. stirringThe mixture is stirred for 2 hours at room temperature
3. distillationthe solvent is then distilled off in vacuo
4. customto leave the residue, which
5. filtrationfollowed by filtration
6. washThe collected crystals are washed successively with an aqueous sodium hydrogen carbonate solution, water and ether
7. customdried