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5680-79-5

(2) Preparation of glycine methyl ester hydrochloride: 60 mL of methanol was added to a 100 mL round-bottomed flask under ice-bath conditions, followed by the slow dropwise addition of 4 mL of sulfoxide chloride (SOCl2) through a constant-pressure dropping funnel (with a drying tube on top). The resulting off-gas was absorbed using NaOH solution. After stirring the reaction mixture for 1 h, 8 mmol of glycine was added and stirring was continued for 30 min at room temperature. Subsequently, the reaction system was warmed up to 66 °C and refluxed for 6 hours. The progress of the reaction was monitored by thin layer chromatography (TLC) using 2% ninhydrin ethanol solution as a color developer until the disappearance of the raw material spot. After completion of the reaction, the solvent was removed by evaporation to give glycine methyl ester hydrochloride in 100% yield.