Preparation of Optically Active 2-Thiazolidinecarboxylic Acid by Asymmetric Transformation.
作者:Tadashi SHIRAIWA、Takashi KATAYAMA、Joji ISHIKAWA、Takeshi ASAI、Hidemoto KUROKAWA
DOI:10.1248/cpb.47.1180
日期:——
Cysteamine was condensed with glyoxylic acid monohydrate in a mixture of acetic acid and ethanol in the presence of (2R, 3R)- or (2S, 3S)-tartaric acid [(R)- or (S)-TA], as the resolving agent, to give the salt of (-)-2-thia-zolidinecarboxylic acid [(-)-2-THC] with (R)-TA or the salt of (+)-2-THC with (S)-TA. Treatment of these salts with triethylamine in methanol afforded (-)- and (+)-2-THC. The (-)- and (+)-2-THC obtained were betermined to be enantiopure forms by comparing their powder X-ray diffiraction patterns with that of (RS)-2-THC. The absolute configurations of (-)- and (+)-2-THC were estimated based on molar rotations of (2R, 4R)- and (2S, 4S)-2, 4-thiazolidinedicarboxylic acids, (R)-4-thiazolidinecarboxylic acid, and (-)- and (+)-2-THC. (-)-2-THC was determined to have the (R)-configuration, and (+)-2-THC to have the (S)-configuration.
半胱胺与乙醛酸一水合物在乙酸和乙醇的混合物中在(2R,3R)-或(2S,3S)-酒石酸[(R)-或(S)-TA]存在下缩合,作为拆分剂,得到(-)-2-硫杂-唑烷甲酸[(-)-2-THC]与(R)-TA的盐或(+)-2-THC与(S)-TA的盐。用三乙胺的甲醇溶液处理这些盐,得到(-)-和(+)-2-THC。通过将所得(-)-和(+)-2-THC的粉末X射线衍射图与(RS)-2-THC进行比较,确定其为对映体纯形式。 (-)- 和 (+)-2-THC 的绝对构型根据 (2R, 4R)- 和 (2S, 4S)-2, 4-噻唑烷二甲酸、(R)-4-噻唑烷甲酸的摩尔旋转进行估计酸、(-)-和(+)-2-THC。确定(-)-2-THC具有(R)-构型,(+)-2-THC具有(S)-构型。