Optical Resolution of (RS)-Mercaptosuccinic Acid and Syntheses of Four Stereoisomers of 2-Amino-3-1(1,2-dicarboxyethyl)sulfanyl)propanoic Acid.
作者:Tadashi SHIRAIWA、Masanori OHKUBO、Motoki KUBO、Hideya MIYAZAKI、Masaki TAKEHATA、Hisashi IZAWA、Kazuo NAKAGAWA、Hidemoto KUROKAWA
DOI:10.1248/cpb.46.1364
日期:——
To synthesize four stereoisomers of 2-amino-3-[(1, 2-dicarboxyethyl)sulfanyl]propanoic acid (ADC), (RS)-mercaptosuccinic acid [(RS)-MSA] was optically resolved using (1S, 2S)-2-amino-1-phenyl-1, 3-propanediol and (R)- and (S)-1-phenylethylamine as resolving agents to yield (R)- and (S)-MSA with optical purities of 100%. In addition, the racemic structures of 1-propylammonium and 1-butylammonium salts of (RS)-MSA were examined based on melting point, solubility, infrared spectra, and binary and ternary phase diagrams, with the aim of optical resolution by preferential crystallization of (RS)-MSA. Results indicated that the 1-butylammonium salt of (RS)-MSA [(RS)-BA salt] exists as a conglomerate and that the 1-propylammonium salt forms a racemic compound. Optical resolution by preferential crystallization of (RS)-BA salt yielded (R)- and (S)-BA salts with optical purities of over 90%. The (R)- and (S)-MSA obtained by optical resolution were condensed with (R)- and (S)- 2-amino-3-chloropropanoic acid hydrochlorides to give (2R, 1'R)-, (2S, 1'S)-, (2R, 1'S)-, and (2S, 1'R)-ADC. In addition, these stereoisomers were also synthesized from D- and L-cysteine and optically active bromosuccinic acid.
为了合成 2-氨基-3-[(1, 2-二羧乙基)硫]丙酸(ADC)的四种立体异构体,以 (1S, 2S)-2- 氨基-1-苯基-1, 3-丙二醇和 (R)- 和 (S)-1- 苯乙胺为分辨剂,对 (RS)-巯基丁二酸[(RS)-MSA]进行了光学分辨,得到了光学纯度为 100%的 (R)- 和 (S)-MSA 。此外,根据熔点、溶解度、红外光谱以及二元和三元相图,研究了(RS)-MSA 的 1-丙基铵盐和 1-丁基铵盐的外消旋结构,目的是通过(RS)-MSA 的优先结晶实现光学分辨。结果表明,(RS)-MSA 的 1-丁基铵盐[(RS)-BA 盐]以团聚体形式存在,而 1-丙基铵盐则形成外消旋化合物。通过对(RS)-BA 盐的优先结晶进行光学解析,得到了光学纯度超过 90% 的(R)-和(S)-BA 盐。通过光学解析得到的(R)-和(S)-MSA 与(R)-和(S)-2-氨基-3-氯丙酸盐酸盐缩合,得到(2R, 1'R)-、(2S, 1'S)-、(2R, 1'S)-和(2S, 1'R)-ADC。此外,这些立体异构体也是由 D-和 L-半胱氨酸以及光学活性溴代丁二酸合成的。