Chemical compounds, their preparation and use

摘要

A compound of formula (I), or a pharmaceutically acceptable salt thereof: (I) wherein X is halogen, amino, perhalomethyl, cyano, C1-6-alkoxy, C1-6-alkylthio or C1-6-alkylamino; A is methyl, halomethyl, cyanomethyl, aminomethyl, vinyl, methylthiomethyl or methoxymethyl; R1 is selected from optionally substituted N-bonded heterocyclics. The compounds have been found useful for treating central nervous system ailments.