Trifluoroacetic acid → (7R)-7-[[(2Z)-2-(2-amino-5-chloro-1,3-thiazol-4-yl)-2-hydroxyiminoacetyl]amino]-3-[(5-amino-1,3,4-thiadiazol-2-yl)sulfanyl]-8-oxo-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A solution of trifluoroacetic acid (10 mL), triethylsilane (5 mL) and dichloromethane (10 mL) was cooled to 0° C. and (7R)-7-[(Z)-2-(2-amino-5-chlorothiazol-4-yl)-2-(triphenylmethoxyimino]acetamido]-3-[5-amino-1,3,4-thiadiazol-2-ylthio]-8-oxo-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylate diphenylmethyl ester from the previous step (2.3 g) was added in portions. The reaction mixture was stirred for 3 hours at 0° C., allowed to warm up to room temperature and evaporated to dryness. The residue was treated with diethyl ether (50 mL) and the solid that formed was filtered and dried to give 2.4 g of crude product. The crude product was purified on HP 20 initially with water elution until the pH was neutral, after which the product was eluted with acetonitrile:water 80:20. The solvent was evaporated to give the 0.65 g of the title compound.

Provenance & Evidence