Resolution and conformational analysis of diastereoisomeric esters of cis- and trans-2-(aminomethyl)-1-carboxycyclopropanes
作者:Rujee K Duke、Robin D Allan、Mary Chebib、Jeremy R Greenwood、Graham A.R Johnston
DOI:10.1016/s0957-4166(98)00250-x
日期:1998.7
restricted analogues of the neurotransmitter γ-aminobutyric acid (GABA), have been resolved by chromatographic separation of the corresponding diastereoisomeric esters which were formed between the cis- and trans-2-(acetamidomethyl)-1-carboxycyclopropanes with (R)-(−)-pantolactone. 1H NMR, semi-empirical conformational analysis, ab initio (DFT) structure and NMR shielding tensor calculations of the cis-diastereoisomers
(1 R,2 S)-,(1 S,2 R)-,(1 R,2 R)-和(1 S,2 S)-2-(氨基甲基)-1-羧基环丙烷,它们的构象受限制类似物神经递质γ-氨基丁酸(GABA)已通过色谱分离与(R)-(-)-泛内酯形成的顺式和反式-2-(乙酰氨基甲基)-1-羧基环丙烷之间形成的相应非对映异构酯而得到分离。1 H NMR,半经验构象分析,从头算(DFT)结构和NMR屏蔽张量的计算顺式-非对映异构体允许顺式-氨基酸的绝对构型分配。