Synthesis of New Photoactivatable Phenylalanine Analogues and Their Incorporation into a Model Peptide − Phenylseleno Derivatives as Precursors of α,β-Unsaturated Ketones in Peptide Synthesis
作者:Valérie Jullian、Véronique Monjardet-Bas、Céline Fosse、Solange Lavielle、Gérard Chassaing
DOI:10.1002/1099-0690(200205)2002:10<1677::aid-ejoc1677>3.0.co;2-8
日期:2002.5
The asymmetric synthesis of (S)-Boc-p-(propanoyl)phenylalanine (10) was performed by alkylation of sultam N-(diphenylmethylene)glycinate (4). Different pathways for the introduction of a phenylseleno moiety α to the ketone function were investigated. (S)-Boc-p-[2′-(phenylselenenyl)propanoyl]phenylalanine (11) was easily obtained from (S)-Boc-p-(propanoyl)phenylalanine (10). However, the phenylseleno
(S)-Boc-p-(丙酰基)苯丙氨酸 (10) 的不对称合成是通过 Sultam N-(二苯基亚甲基) 甘氨酸 (4) 的烷基化进行的。研究了将苯基硒基部分 α 引入酮功能的不同途径。(S)-Boc-p-[2'-(苯基硒烯基)丙酰基]苯丙氨酸(11)很容易从(S)-Boc-p-(丙酰基)苯丙氨酸(10)获得。然而,发现羰基的 α 苯基硒基部分对于固相肽合成所需的条件是不稳定的。因此,(2S)-Boc-p-[2'-(苯基硒基)丙酰基]苯丙氨酸(11)被转化为Boc-p-[3'-(苯基硒基)丙酰基]苯丙氨酸(13),并成功掺入到模型肽的序列。发现在温和酸性条件下产生的相应烯酮官能团在 pH = 7 的水溶液中是稳定的,但在辐射时具有适当的反应性。因此,这些带有不饱和酮的苯丙氨酸类似物代表了新的光反应探针。(© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany