48ABSTRACT OF THE DISCLOSUREThe invention relates to novel tricyclicderivatiYes which are useful agonists of cholinergicreceptors and to drugs containing them. Thesederivatives have the following formula: (I)in which:- X rspxesents a group (CH2)n, n representing an integerequal to 2, 3 or 4, or alternatively a vinylene group ora methylvinylene group;- R1 and R2, considered independently, representhydrogen or a substituent occupying one of the freepositions of the benzene ring and selected from thegroup comprising halogens, a lower alkyl group, a loweralkoxy group, a hydroxyl group, a thiol group, a nitrogroup and an optionally substituted amino group:- Y represents oxygen, sulfur or a group -NH-; and- R3 is an amino group, which is- a group , in which:? Alk represents a linear or branched alkylenzgroup having from 2 to 5 carbon atoms; and? R4 and R5 each independently represent hydrogen,a lower alkyl grsup or a lower hydroxyalkyl group,or alternatively R4 and R5 forms with the nitrogenatom to which they are bonded, an unsubstituted orlower-alkyl substituted pyrrolidin-l-yl,piperidino, morpholino, piperazin-l-yl or 2-oxo-morphol ino group;49- a group -CH2 , in which R6 represents; alower alkyl group having 1 to 4 carbon atoms; or- a group , in which R6 is as definedabove;and their salts with pharmaceutically acceptable mineralor organic acids.
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