Provided is a method for preparing L-BPA, which includes steps of: reacting N-protected (S)-4-halophenylalanine of Formula I, a boronating agent, Grignard reagent and bis(2-methylaminoethyl)ether to obtain a reaction mixture, wherein the reaction mixture comprises N-protected (S)-4-boronophenylalanine of Formula II and the R
2
group represents a protecting group;
isolating the N-protected (S)-4-boronophenylalanine from the reaction mixture; and deprotecting the R
2
group of the N-protected (S)-4-boronophenylalanine to obtain L-BPA, wherein the L-BPA has a structure of Formula III.
提供了一种制备L-
BPA的方法,包括以下步骤:将式I中的N-保护的(S)-4-卤苯丙
氨酸、
硼化试剂、
格氏试剂和双(2-甲基
氨基乙基)醚反应,得到反应混合物,其中反应混合物包括式II中的N-保护的(S)-4-
硼苯丙
氨酸,R2基团代表保护基;
从反应混合物中分离出N-保护的(S)-4-
硼苯丙
氨酸;去保护N-保护的(S)-4-
硼苯丙
氨酸的R2基团,得到L-
BPA,其中L-
BPA具有式III的结构。