作者:Gregory S. Hamilton、Zhiwen Huang、Xiao Jing Yang、Raymond J. Patch、B. A. Narayanan、John W. Ferkany
DOI:10.1021/jo00077a058
日期:1993.12
(2R,4R,5S)-2-Amino-4,5-(1,2-cyclohexyl)-7-phosphonoheptanoic acid (15) has been prepared by an efficient nine-step route (16% overall yield) which uses chemoenzymatic processes to establish all absolute stereochemistry. This compound was found to be the most active isomer of the previously reported isomeric mixture, NPC 12626. In addition, synthetic routes were developed for the stereochemically unambiguous preparation of all the other cis isomers of this racemate. All of the synthetic pathways utilized enzymatic hydrolysis of a meso diester to prepare key optically pure building blocks. Pharmacological evaluation of the isomers indicates that 15 is one of the most potent and least toxic NMDA antagonists discovered to date.
通过高效九步路线(总产率16%)制备了(2R,4R,5S)-2-氨基-4,5-(1,2-环己基)-7-磷基庚酸(15),该路线采用化学酶法工艺来确定所有绝对立体化学。该化合物被发现是先前报道的异构体混合物NPC 12626中最活跃的异构体。此外,还开发了合成路线,以明确的立体化学制备该外消旋体的所有其他顺式异构体。所有合成途径均利用了对meso二酯的酶解水解,以制备关键的光学纯构建块。对异构体的药理学评价表明,15是迄今为止发现的最具活性且毒性最小的NMDA拮抗剂之一。