The invention relates to novel pyrrolidine derivatives represented by formula (1): ##STR1## wherein: R1 represents (1) a lower alkyl group having 1 to 6 carbon atoms, or (2) a 3- to 15-membered mono- or fused cyclic hydrocarbon group which may contain a hetero atom on the ring, or which may be substituted with a substituent(s); each of n and m represents an integer and the sum of n and m is an integer of 0 to 2; each of X and E represents oxygen, NR' (wherein R' is hydrogen or a lower alkyl group having 1 to 6 carbon atoms), sulfur, phenylene, CH.dbd.CH or CH.sub.2 ; A represents an amino acid residue or an imino acid residue, which functional group may be optionally protected, or a glycine residue which may be substituted at the amino moiety thereof; and, Y1 represents a cycloalkyl group having 3 to 8 carbon atoms; or a salt thereof. The pyrrolidine derivatives inhibit a prolyl endopeptidase and are expected to be effective for the treatment of amnesia.
该发明涉及由式(1)表示的新型
吡咯烷衍
生物:
其中:R1代表(1)具有1至6个碳原子的低碳基,或(2)具有3至15个成员的单环或融合
环烃基,该基可能在环上含有杂原子,或者可能被取代基取代;n和m各自代表整数,n和m的和为0至2的整数;X和E各自代表氧、NR'(其中R'是氢或具有1至6个碳原子的低碳基)、
硫、苯基、CH.dbd.CH或CH.sub.2;A代表
氨基酸残基或亚
氨基酸残基,其功能基团可以选择性地被保护,或者是甘
氨酸残基,其
氨基团可能被取代;Y1代表具有3至8个碳原子的环烷基;或其盐。这些
吡咯烷衍
生物抑制脯
氨酸内切酶,预计对失忆症的治疗具有有效性。