(2S,3S)-2-Amino-3-hydroxy-5-(4-nitrophenoxy)pentanoic acid (5) was prepared stereoselectively as the NFmoc, O-(tert-butyl)-protected derivative 5a in eleven steps from ethyl (E)-4-benzyloxypent-2-enoate (6). This protected amino acid was used for the solid-phase peptide synthesis of oligopeptides, which serve as sequence-specific chromogenic protease substrates when used in the presence of NaIO4 and bovine serum albumin. The peptide 1 (KRAVNle-5-EANleNH(2) (Nle - norleucine)) allows detection of HIV-protease activity spectrophotometrically at 405 nm.
(2S,3S)-2-
氨基-3-羟基-5-(4-
硝基苯氧基)
戊酸 (5) 是通过从乙基 (E)-4-苯氧基戊-2-烯酸酯 (6) 开始,在十一步反应中选择性地制备为其NFmoc、O-(叔丁基)保护的衍
生物 5a。该保护的
氨基酸被用于固相肽合成,生成寡肽,这些寡肽在NaIO4和
牛血清白蛋白的存在下作为序列特异性显色
蛋白酶底物。肽 1 (KRAVNle-5-EANleNH2,其中Nle为 norleucine) 允许在 405 nm 处通过分光光度法检测 HIV-
蛋白酶活性。