Benzyl glycinate → Pyruvyl-glycine benzyl ester

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Reaction Steps

More preferably the thionyl chloride or oxalyl chloride is added to a mechanically stirred suspension of sodium pyruvate in dichloromethane whereby a gas is evolved and pyruvylchloride is yielded. The pyruvylchloride is cooled during the dropwise addition of glycine benzyl ester solution to yield pyruvyl-glycine benzyl ester following the warming to room temperature, the addition of water, separation, washing with diluted hydrochloric acid and brine, drying with magnesium sulfate, evaporation of the dichloromethane, precipitation, filtering and drying again. The pyruvyl-glycine benzyl ester is then charged in a hydrogen pressure vessel with ethyl acetate and 4% to 20% palladium on carbon, with the hydrogen pressure being approximately 40-150 psi, such that hydrogen is digested whereby following warming, filtering, concentration, precipitation, filtering and drying there is yielded pyruvyl-glycine.

Provenance & Evidence