1-Hydroxybenzotriazole → 3-Mercaptopyridine-2-carboxylic acid N-((methoxycarbonyl)methyl)amide

Beteiligte Stoffe

Reaktionsschritte

1.69 g of 3-mercaptopyridine-2-carboxylic acid were dissolved in 20 ml of DMF and 7.5 ml of N-ethylmorpholine, 1.7 g of 1-hydroxy-1H-benzotriazole, 5 g of N-cyclohexyl-N'-(2-morpholinoethyl)-carbodiimide methyl-p-toluenesulfonate and 4.3 g of glycine methyl ester hydrochloride were added successively at room temperature and whilst stirring. After having been stirred for 12 hours, the mixture was partitioned between a saturated aqueous solution of ammonium chloride and dichloromethane and the organic phase was dried and concentrated by evaporation; the residue was purified by chromatography on silica gel (eluent: ethyl acetate/heptane); yield, 0.65 g of colourless crystals of m.p. 178°-179° C. (ethyl acetate/heptane).

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