The invention relatests compound of formula (I): ##STR00001## wherein: n is 1, 2 or 3, A represents a group ##STR00002## X represents N or NR.sup.1, R.sup.2 represents an alkoxy, cycloalkyloxy or cycloalkylalkyloxy group. and medicinal products containing the same which are useful in treading or in preventing melatoninergic disorder.