Acetic acid, 2-(2-naphthalenylthio)- → (Z)-(6R,7R)-3-(3-acetoxy-propenyl)-7-[2-(naphthalen-2-ylsulfanyl)-acetylamino]-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid

Participants

Reaction Steps

To a solution of 10.5 g (48 mmol) of naphthalen-2-ylsulfanyl-acetic acid in 80 ml of N,N-dimethylacetamide were added 7.8 g (48 mmol) of 1,1′-carbonyldiimidazole and the reaction mixture was stirred for 0.5 h at 20° under an atmosphere of argon. To the yellow solution were added 11.93 g (0.5 mmol) of (Z and E)-(6R,7R)-3-(3-acetoxy-propenyl)-7-amino-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid and stirring was continued for 3 h at 20°. The brown solution was diluted with ethyl acetate (0.5 1), washed with 1 N hydrochloric acid (0.2 1) and with water (5×0.1 1), dried over sodium sulfate and evaporated in vacuo. The remaining material was crystallized from ethyl acetate to give 11.7 g (58%) of (Z)-(6R,7R)-3-(3-acetoxy-propenyl)-7-[2-(naphthalen-2-ylsulfanyl)-acetylamino]-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid as a light brown solid.

Provenance & Evidence