| 摘要 |
<p>Substituted pyrrolidin-2-ones of the formula <IMAGE> (I) wherein R1 represents a phenyl or naphthyl radical that is unsubstituted or substituted by lower alkyl, lower alkloxy, halogen and/or trifluoromethyl, X1 represents lower alkylidene, X2 represents methylene, ethylene or oxoethylene and R2 represents hydrogen, lower alkyl or a radical of the formula <IMAGE> (Ia) wherein X4 represents lower alkylidene and R3 represents hydrogen or a phenyl or a phenyl naphthyl radical that is unsubstituted by lower alkyl, lower alkoxy, halogen and/or trifluoromethyl, and their pharmaceutically acceptable salts, have nootropic properties and can be used as nootropic active ingredients in medicaments. They are prepared, for example, by condensing with one another compounds of the formulae <IMAGE> (II) and <IMAGE> (III) wherein Z1 represents a group of the formula -X1-(=O)-Z3 (IIa) and Z2 represents hydrogen, or Z1 represents hydrogen and Z2 represents a group of the formula -C(=O) -X1-Z4 (IIIa), wherein each of Z3 and Z4 represents a removable radical and R2' represnts a radical R2 or amino-protecting group, or their salts, and removing an amino-protecting R2' which may be present.</p> |
