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取代的苯甲醛与硝基乙酸甲酯经四步反应可得取代苯丙氨酸盐酸盐。制备3时使用(CH_3)_2NH_2~+Cl~--KF 为缩合剂,可克服过去缩合产物主要是双加成物的缺点。还原必须分步进行否则得不到5。
Substituted benzaldehyde and methyl nitroacetate obtained by four-step reaction of substituted phenylalanine hydrochloride. Preparation (3) using (CH_3) _2NH_2 ~ + Cl ~ - KF as a condensing agent can overcome the shortcomings of the previous condensation products are mainly double adducts. Restore must be done step by step or not get 5.