Synthesis of the novel .pi.-(benzyloxymethyl)-protected histidine analog of statine. Inhibition of penicillopepsin by pepstatin-derived peptides containing different statine side-chain derivatives
作者:Juergen Maibaum、Daniel H. Rich
DOI:10.1021/jm00127a028
日期:1989.7
inhibitor 3 and 2-3 times more potent than the new (3S,4S)-4-amino-3-hydroxy-5-phenylpentanoic acid (AHPPA) analogue 17 (Ki = 1.5 x 10(-8) M). However, compound 16, which has an imidazole residue at the P1 position, is a significantly weaker inhibitor of the enzyme than the corresponding analogues with the lysine (5) and ornithine (6) side chains at P1. Considerations that led to the synthesis of 16 and
衍生自一种新的他汀(Sta),(3S,4S)-4-氨基-3-羟基-5-(咪唑-4-基)戊酸(HiSta,20)的组氨酸侧链类似物的天冬氨酸蛋白酶抑制剂的合成),被报告。Boc-HiSta(BOM)-OMe(7)以Boc-His(pi-BOM)-OH的总收率为16%的方式制备,方法是形成四酸衍生物11并用NaBH4进行立体选择性顺式还原成4-羟基内酰胺12 ·通过DCC / HOBt预活化方法,从酯7(对映体纯度ee = 88-90%)上除去Boc基团,并偶联至三肽链段Iva-Val-Val-OH(13),然后氢解除去pi-。碳上Pd(OH)2上的BOM组得到Iva-Val-Val-HiSta-OMe(16)。这种新的肽16是真菌天冬氨酸蛋白酶Penicillopsepsin的非常有效的抑制剂(Ki = 4。5 x 10(-9)M),其活性是同类含Sta的抑制剂3的10倍,且效力是新的(3S