Formic Acid → HCID 53939500, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 2-benzhydryloxycarbonyl-7-[2-methoxyimino-2-(2-tritylamino-thiazol-4-yl)-acetamido]-8-oxo-3-(2-tosyloxyvinyl)-5-thia-1-aza-bicyclo[4.2.0]-oct-2-ene (syn isomer, E-form) (5.93 g) in a mixture of pure formic acid (80 cc) and water (25 cc) is heated at 50° C. for 30 minutes. The mixture is then cooled to 20° C., filtered and concentrated to dryness at 30° C. under 20 mm Hg (2.7 kPa). The residue is taken up in acetone (150 cc), the mixture is concentrated to dryness at 20° C. under 20 mm Hg (2.7 kPa), the operation is repeated twice more and the residue is then triturated in ether (75 cc) and filtered off. 7-[2-(2-Amino-thiazol-4-yl)-2-methoxyimino-acetamido]-2-carboxy-8-oxo-3-(2-tosyloxyvinyl)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene (syn isomer, E-form) (3.4 g) is obtained in the form of a yellow powder.

Provenance & Evidence