The present invention discloses a new .alpha.-keto amide derivative or a salt thereof represented by the formula (1): ##STR1## wherein X represents (1) a peptide residue or amino acid residue in which the functional group may be protected, (2) a hydrogen atom or (3) an amino-protective group, Y represents a peptide residue or amino acid residue in which the functional group may be protected, E represents a substituent on the alkylene (C.sub.n H.sub.2n-1) and is a halogen, lower alkoxy or hydrogen, A represents a carbonyl group or mono- or di-substituted methylene (the substituent being a hydroxy, lower alkoxy, phenylimino or benzylimino), and n represents an integer of 2 to 6. The compound of the present invention is effective in inhibiting prolyl endopeptidase activity and useful as an active ingredient of an enzyme inhibitor.
本发明披露了一种由式(1)表示的新的α-酮酰胺衍
生物或其盐:##STR1## 其中X代表(1)可以保护功能基团的肽残基或
氨基酸残基,(2)氢原子或(3)
氨基保护基团,Y代表可以保护功能基团的肽残基或
氨基酸残基,E代表取代烷基(C.sub.n H.sub.2n-1)上的取代基,是卤素,较低的烷氧基或氢,A代表羰基或单取代或双取代亚甲基(取代基为羟基,较低的烷氧基,苯基
亚胺或苄基
亚胺),n表示2到6的整数。本发明的化合物能有效抑制脯
氨酰内肽酶活性,是酶
抑制剂的有效成分。