Chemistry of 4-fluoroglutamic acid. Part 4. Resolution of the racemic erythro and threo forms through their diastereomeric salts
作者:Vladimı́r Tolman、Petr Šimek
DOI:10.1016/s0022-1139(99)00187-6
日期:2000.1
could not be resolved underivatized, however, the resolution of its N-acetyl derivative with quinine proceeded smoothly to give the insoluble salt of the (2S, 4S) acid. Decomposition of the pure salts by acid and (in the case of the threo compound) hydrolytic removal of the N-acetyl group, furnished the desired 4-fluoroglutamic acid enantiomers with 99–100% optical purity.
外消旋的赤型-(2 S,4 R ; 2 R,4 S)-4-氟谷氨酸可以与金鸡宁结合,在与(2 S,4 R)对映异构体形成微溶的盐的情况下成功拆分,无需衍生化。从母液中分离的(2 R,4 S)对映体的更易溶的盐进一步纯化,以达到足够的光学纯度。的苏式- (2-小号,4小号; 2 - [R,4 - [R ,)- 4- fluoroglutamic酸不能被解析未衍生化的,然而,它的分辨率Ñ带有奎宁的-乙酰基衍生物可顺利进行,得到(2 S,4 S)酸的不溶盐。用酸分解纯净的盐,以及(在苏式化合物的情况下)水解除去N-乙酰基,可提供具有99-100%光学纯度的所需4-氟谷氨酸对映体。