Asymmetric Synthesis and Conformational Analysis by NMR Spectroscopy and MD of Aba- and α-MeAba-Containing Dermorphin Analogues
作者:Bart Vandormael、Rien De Wachter、José C. Martins、Pieter M. S. Hendrickx、Attila Keresztes、Steven Ballet、Jayapal R. Mallareddy、Fanni Tóth、Géza Tóth、Dirk Tourwé
DOI:10.1002/cmdc.201100314
日期:2011.11.4
ee. [(S)‐Aba 3‐Gly 4]dermorphin retained μ‐opioid affinity but displayed an increased δ‐affinity. The corresponding R epimer was considerably less potent. In contrast, the [(R)‐α‐MeAba 3‐Gly 4]dermorphin isomer was more potent than its S epimer. Tar‐MD simulations of both non‐methylated [Aba 3‐Gly 4]dermorphin analogues showed a degree of folding at the C‐terminal residues toward the N terminus of the
含有(S)-和(R)-4-氨基-1,2,4,5-四氢-2-苯并ze庚因-3-酮骨架(Aba)和α-甲基化类似物作为构象受限的苯丙氨酸的Dermorphin类似物,准备好了。不对称相转移催化无法提供(小号)-α-ME- ø -cyanophenylalanine前体(小号)-α-MeAba在可接受的对映体纯度。但是,通过使用Schöllkopf手性助剂,该中间体的收率为88%ee。[(S)‐Aba 3-Gly 4] dermorphin保留了μ阿片样物质的亲和力,但显示出增加的δ-亲和力。相应的R 差向异构体的效力明显较低。相反,[(R)-α-MeAba3-Gly 4] dermorphin异构体比其S 差向异构体更有效。两种未甲基化的[Aba 3–Gly 4] dermorphin类似物的Tar–MD模拟显示,在C端残基朝着肽的N端折叠了一定程度,但是没有采用稳定的β-转角构象。所述α甲基化的类似物,在另一方面,显示出类型I