A novel synthesis of (R)- and (S)-α-alkylated aspartic and glutamic acids: α-alkylated aspartic succinimides as new type of β-turn type II and II′ mimetics
作者:Daniel Obrecht、Udo Bohdal、John Daly、Christian Lehmann、Peter Schönholzer、Klaus Müller
DOI:10.1016/0040-4020(95)00665-u
日期:1995.10
A novel and efficient synthesis of optically pure (R)- and (S)-α-methyl glutamic acid (1), (R)- and (S)-α-methyl aspartic acid (2a) and (R)- and (S)-α-isobutyl aspartic acid (2b) using L-phenylalanine cyclohexylamide 4 as chiral auxiliary is described. Crystal structures show that the (R)- and (S)-α-methyl glutamic acid derivatives (S,S)-5 and (R,S)-6 adopt β-turn type I geometries, whereas the corresponding
一种新颖而有效的合成光学纯的(R)-和(S)-α-甲基谷氨酸(1),(R)-和(S)-α-甲基天门冬氨酸(2a)和(R)-和(描述了使用L-苯丙氨酸环己酰胺4作为手性助剂的S)-α-异丁基天冬氨酸(2b)。晶体结构表明(R)-和(S)-α-甲基谷氨酸衍生物(S,S)-5和(R,S)-6采用β转角的I型的几何形状,而相应的天冬酰亚胺衍生物(R,S) - 12A,12B形式的β转角II型和(S,S) - 11A β转角型II'。这些发现表明,(R)-和(S)-α-烷基天冬氨酸的琥珀酰亚胺衍生物可根据其绝对构型用作稳定肽中II型(或II')的β-转角的结构单元。