| 摘要 |
Compound of formula (I):wherein:n represents 0 or 1,R1 represents hydrogen, arylalkyl, alkyl, acyl, alkoxycarbonyl, arylalkoxycarbonyl or trifluoroacetyl,R2 represents alkyl,X represents oxygen, chlorine, OR3, SR4 or NOR5,R3 represents hydrogen , alkyl, acyl, alkoxycarbonyl or arylalkoxycarbonyl,R4 represents hydrogen, alkyl or aryl,R5 represents hydrogen or optionally substituted alkyl,<CUSTOM-CHARACTER FILE="US06451789-20020917-P00900.TIF" ALT="custom character" HE="20" WI="20" ID="CUSTOM-CHARACTER-00001"/> represents a single or double bond,Ar represents aryl or heteroaryl, its isomers and addition salts thereof with a pharmaceutically acceptable acid, and medicinal products containing the same which are useful as facilitators of memory and cognition and antalgic agents.
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