反应详情

A suspension of 0.499 g (1.81 mmole) of cis-2-azidomethyl-4-oxo-3-phenoxyacetylaminoazetidine and 0.189 g of 10% palladium on carbon in 25 ml of absolute ethanol was hydrogenated at atmospheric pressure and at 40° for 1 hour. The solution was filtered through celite and the solvent was removed in vacuo to afford a colorless gum which was dissolved in 15 ml of methylene dichloride. Anhydrous magnesium sulfate was added followed by addition of a solution of 0.314 g (1.91 mmole) of benzyl glyoxalate in 10 ml of methylene dichloride. The reaction mixture was stirred at room temperature under argon for 2.5 hours then was allowed to stand at 0° overnight. After filtering the reaction mixture, the solvents were removed in vacuo to give a semi-crystalline residue which was recrystallized from ethyl acetate-hexane to give N-(cis-4-oxo-3-phenoxyacetylamino-2-azetidinylmethyl)iminoacetic acid benzyl ester as a colorless solid.

1. filtrationThe solution was filtered through celite
2. customthe solvent was removed in vacuo
3. customto afford a colorless gum which
4. waitto stand at 0° overnight
5. filtrationAfter filtering the reaction mixture
6. customthe solvents were removed in vacuo
7. customto give a semi-crystalline residue which
8. customwas recrystallized from ethyl acetate-hexane