The present invention relates to compounds of the formula: ##STR1## wherein R is H or alkyl; Y.sup.1 is --CH.dbd. or --N.dbd.; and Y.sup.2 --CH.dbd., --C(OH).dbd., --C(NO.sub.2).dbd., --C(NH.sub.2).dbd., --C(Hal).dbd., --N.dbd.; X is cycloalkenyl; bicyclo[2.2.1]hept-2-yl, optionally substituted by phenyl-2-oxo-5 -methoxymethyl-oxazolidinyl; bicyclo[2.2.1]-hept-5 -en-2-yl; adamantyl; or cycloalkyl or piperidinyl, optionally substituted by amino, alkyl, --CN, oxo hydroxyimino, ethylenedioxy or by --OR.sup.1, R.sup.1 is --CH(C.sub.6 H.sub.5).sub.2, --(CH.sub.2).sub.n C.sub.6 H.sub.5, alkyl, H, --(CH.sub.2).sub.n NHCOCH.sub.3, --(CH.sub.2).sub.n NH.sub.2, --(CH.sub.2).sub.n CN, --(CH.sub.2).sub.n SCH.sub.3 --(CH.sub.2).sub.n SO.sub.2 CH.sub.3, --CO-lower-alkyl, --COC.sub.6 H.sub.5, optionally substituted by oxazolidine; or by .dbd.CR.sup.2 R.sup.3, R.sup.2 is alkyl R.sup.3 is H, --CN, alkyl, phenyl or COO-alkyl; or by --(CH.sub.2).sub.n R.sup.4 R.sup.4 is --CN, amino, --NHCOCH.sub.3, --COC.sub.6 H.sub.5 Hal, phenyl or hydroxy; or by --COR.sup.5, R.sup.5 is alkyl, --CH.dbd.CH--C.sub.6 H.sub.5, --C.sub.6 H.sub.5, --C.sub.6 H.sub.5 CF.sub.3 or --O-alkyl; or by --NR.sup.6 R.sup.7, R.sup.6 is or --COCH.sub.3 ; R.sup.7 is --COCH.sub.3, benzyl or --(CH.sub.2).sub.n NHCOC.sub.6 H.sub.4 Hal; and n is 1-3; These can be used for the prevention or control of depressive, panic and anxiety states, and treatment of certain cognitive disorders and neurodegenerative diseases.