Triethylamine → Mafenide Acetate

Participants

Reaction Conditions

Reaction Steps

Intermediate 1 and (4R,5S,6S)-4nitrobenzyl 6-((R)-1-hydroxyethyl)-4-methyl-7-oxo-3-(((3S,5S)-5-((4-sulfamoylbenzyl)carbamoyl)pyrrolidin-3-yl)thio)-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate (raw material 3) (2980 g, 5.01 mol) were dissolved in dimethylformamide, and the solution was cooled to −15° C. Triethylamine was added dropwise under nitrogen protection. After the reaction is over, ethyl acetate was added. The mixture was sequentially washed with water, dilute hydrochloric acid and saturated sodium bicarbonate, and the organic layer was dried over anhydrous sodium sulfate. The ethyl acetate layer was concentrated and the precipitate was filtered, and dried to obtain 3300 g of a solid (i.e. intermediate 2) with a yield of 79.46% and a purity of 94.75%.

Provenance & Evidence