Amino acid derivatives of the formula ##STR1## wherein: Q is W--(CH.sub.2).sub.m --(A).sub.n --CO--B-- wherein A is oxygen atom or --NH--; B is ##STR2## or --(CH.sub.2).sub.l -- wherein X is sulfur atom or --CH.sub.2 --, and l is an integer from 1 to 3; W is ##STR3## wherein Hal is halogen atom; n is an integer of 0 or 1; and m is an integer from 0 to 3; Y is sulfur atom or --CH.sub.2 --; and R is hydrogen atom, formyl group, C.sub.1-5 alkoxycarbonyl group, --C.tbd.N or ##STR4## wherein R.sup.1 is hydrogen atom, and R.sup.2 is hydroxyl group, C.sub.1-5 alkylcarboxy group, phenylcarboxy group, C.sub.1-5 alkoxy group or phenyl C.sub.1-5 alkoxy group; with the proviso that when R is hydrogen atom, formyl group or C.sub.1-5 alkoxycarbonyl group, W is ##STR5## The compounds mentioned above specifically inhibit prolyl endopeptidase activity and are useful as agents for the treatment and prevention of dementia and amnesia.
该化合物的
氨基酸衍
生物的
化学式为##STR1##其中:Q是W--(CH.sub.2).sub.m --(A).sub.n --CO--B--,其中A是氧原子或--NH--;B是##STR2##或--(CH.sub.2).sub.l --其中X是
硫原子或--CH.sub.2--,l是1到3的整数;W是##STR3##其中Hal是卤素原子;n为0或1的整数;m是0到3的整数;Y是
硫原子或--CH.sub.2--;R是氢原子、甲酰基、C.sub.1-5烷氧羰基、--C.tbd.N或##STR4##其中R.sup.1是氢原子,R.sup.2是羟基、C.sub.1-5烷基羧基、苯基羧基、C.sub.1-5烷氧基或苯基C.sub.1-5烷氧基;但当R为氢原子、甲酰基或C.sub.1-5烷氧羰基时,W是##STR5##上述化合物特异性抑制脯
氨酸内切酶活性,并可用作治疗和预防痴呆和健忘症的药物。