Hydrochloric Acid → HCID 178498871, Verbindung

Beteiligte Stoffe

Reaktionsschritte

Methanol (1.54 ml, 0.0381 mole) was added to a suspension of sodium (0.876 g, 0.0381 mole) in dry tetrahydrofuran and the mixture stirred for 30 minutes. A solution of N-formyl-(3,5-difluorobenzyl)glycine methyl ester (8.50 g, 0.0349 mole) prepared as above in methyl formate (6.57 ml, 0.107 mole) was added dropwise to the sodium methoxide solution with cooling at 10° to 15° C. and the resulting mixture was stirred overnight at room temperature. The solvent was removed under vacuum and the residue was diluted with 100 ml water-methanol (1:1). The solution was treated with activated carbon, filtered and cooled in ice. Hydrochloric acid (12 N, 6.4 ml) and a solution of potassium thiocyanate (4.25 g, 0.0437 mole) in a minimum amount of water were added and the resulting solution was heated at 65°-70° C. for 24 hours. The solution was treated with activated carbon, filtered, and the solvent was removed under vacuum until a precipitate formed. The mixture was cooled in ice and the product filtered and washed with a mixture of methanol-water. The product was triturated with ethanol, filtered and dried to give 1-(3,5-difluorobenzyl)-2-mercaptoimidazole-5-carboxylic acid methyl ester, m.p.: 177°-178° C. (6.75 g, 68%).

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