Optical Resolution by Preferential Crystallization of (RS)-2-Benzoylamino-2-benzyl-3-hydroxypropanoic Acid and Its Use in Synthesizing Optically Active 2-Amino-2-methyl-3-phenylpropanoic Acid.
作者:Tadashi Shiraiwa、Masahiro Suzuki、Yoshio Sakai、Hisashi Nagasawa、Kazuhiro Takatani、Daisuke Noshi、Kenji Yamanashi
DOI:10.1248/cpb.50.1362
日期:——
and binary and ternary phase diagrams, with the aim of optical resolution by preferential crystallization of (RS)-2. Results indicated that the (RS)-2 exists as a conglomerate at room temperature, although it forms a racemic compound at the melting point. The optical resolution by preferential crystallization yielded (S)- and (R)-2 with optical purities of about 90%, which were fully purified by recrystallization
为了合成旋光的2-氨基-2-甲基-3-苯基丙酸(1),首先使用辛可尼定作为光学拆分(RS)-2-苯甲酰基氨基-2-苄基-3-羟基丙酸[(RS)-2]。以(RS)-2起始量的一半为基础,以约70%的产率产生光学纯的(S)-和(R)-2的拆分剂。接下来,基于熔点,溶解度,IR光谱以及二元和三元相图检查(RS)-2的外消旋结构,目的是通过(RS)-2的优先结晶获得光学分辨率。结果表明,(RS)-2在室温下以团块形式存在,尽管它在熔点形成外消旋化合物。通过优先结晶的光学拆分产生具有约90%光学纯度的(S)-和(R)-2,它们通过重结晶被完全纯化。