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在-10℃条件下,将5g L-天门冬氨酸(37.6mmol)缓慢加入至含有3.8mL(41.2mmol)SOCl?的26mL无水甲醇溶液中。反应混合物于室温下持续搅拌2小时,随后加入75mL二乙醚以促进产物沉淀。通过过滤收集生成的白色固体,并用2×50mL乙醚洗涤,最终得到(S)-天冬氨酸-β-甲酯盐酸盐,产率为85%。产物为白色固体。1H NMR(300MHz,DMSO)表征数据如下:δ(ppm)= 3.05(dd,J = 3.4,4.7Hz,2H,CH?),3.78(s,3H,OCH?),4.31-4.35(m,1H,CHN)。
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