<i>N</i>-Methyl-<scp>d</scp>-aspartic Acid Receptor Agonists: Resolution, Absolute Stereochemistry, and Pharmacology of the Enantiomers of 2-Amino-2-(3-hydroxy-5-methyl-4-isoxazolyl)acetic Acid
作者:Ulf Madsen、Karla Frydenvang、Bjarke Ebert、Tommy N. Johansen、Lotte Brehm、Povl Krogsgaard-Larsen
DOI:10.1021/jm950393q
日期:1996.1.1
and (2S)-2-[3-(benzyloxy)-5-methyl-4-isoxazolyl]N-tert-butyl-2- [N-[(S)-1-phenylethyl]benzamido]-acetamide (16 and 17, respectively) were synthesized and separated chromatographically. The absolute stereochemistry of 16 was confirmed by an X-ray analysis. Deprotection of these intermediates did, however, provide (R)- (8) and (S)- (9) AMAA, respectively, in extensively racemized forms. N-BOC-protected
(R,S)-2-氨基-2-(3-羟基-5-甲基-4-异恶唑基)乙酸[(R,S)-AMAA,4]是一种对N-甲基-有效的选择性激动剂D-天冬氨酸(NMDA)亚型的兴奋性氨基酸受体。使用Ugi“四组分缩合”方法,两个非对映异构体(2R)-和(2S)-2- [3-(苄氧基)-5-甲基-4-异恶唑基] N-叔丁基-2- [N合成-[[(S)-1-苯基乙基]苯甲酰胺基]-乙酰胺(分别为16和17),并进行色谱分离。通过X射线分析证实了16的绝对立体化学。然而,这些中间体的脱保护确实以广泛消旋的形式分别提供了(R)-(8)和(S)-(9)AMAA。N-BOC保护的(R,S)-AMAA(21)通过使用辛可尼定形成非对映异构体盐而成功分离。通过手性HPLC测定通过该拆分获得的8和9的立体化学纯度和稳定性。(R)-AMAA(8)对[3H] AMPA受体位点表现出峰值亲和力(IC50 = 72 +/- 13