Methyl 3-aminopropionate hydrochloride

67-56-1

107-95-9

3196-73-4

Under ice bath conditions, 60 mL of methanol was added to a 100 mL round-bottom flask, followed by the slow dropwise addition of 4 mL of sulfoxide chloride (SOCl2) through a constant-pressure dropping funnel (with a desiccant tube at the top), and the resulting off-gas was absorbed with NaOH solution. After stirring the reaction mixture for 1 h, 8 mmol of β-alanine 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 reaction process was monitored by thin-layer chromatography (TLC) using a 2% ethanol solution of ninhydrin as a color developer until the raw material spot disappeared. Upon completion of the reaction, the solvent was removed by distillation to afford methyl 3-aminopropionate hydrochloride in 100% yield.