Hypodiphosphorous tetraiodide → 1,1-Dimethylethyl 7-[2-(2-tritylaminothiazol-4-yl)-2-methoxyimino-acetamido]-8-oxo-3-methoxymethyl-4-thia-1-azabicyclo[4,2,0]oct-2-ene-2-carboxylate

Participants

Reaction Steps

4,44 g of diphosphorus tetraiodide suspended in 35 ml of pyridine was stirred for 5 minutes and then 3.058 g of 1,1-dimethylethyl 7-[2-(2-tritylaminothiazol-4-yl)-2-methoxyimino-acetamido]-8-oxo-2-hydroxy-3-methoxymethyl-4-thia-1-azabicyclo[4,2,0]octane-2-carboxylate were added all at once and the mixture was stirred for 2 hours 40 minutes. The pyridine was distilled off and the residue was taken up in 50 ml of ethyl acetate. The mixture was filtered, and 50 ml of N hydrochloric acid were added to the liltrate which was vigorously stirred. The organic phase was decanted, washed with water, dried and concentrated to dryness under reduced pressure. The residue was chromatographed on silica with a methylene chloride-ethyl acetate mixture (85-15) and the recovered fractions were concentrated to dryness and crystallized from methanol to obtain 703 mg of 1,1-dimethylethyl 7-[2-(2-tritylaminothiazol-4-yl)-2-methoxyimino-acetamido]-8-oxo-3-methoxymethyl-4-thia-1-azabicyclo[4,2,0]oct-2-ene-2-carboxylate.

Provenance & Evidence