Cyclopenta[e] [1,5] benzodiazepin-10 (9H)-one derivatives as CNS depressant agents

A series of dialkylaminoalkyl derivatives of cyclopenta[e] [1,5] benzodiazepin-10(9H)-one (E1-4) and its 6-chloro derivative (E5-8) was prepared to evaluate their CNS activity in comparison with that of isosteric pyridodiazepinones (A1-4) previously described. The results of the pharmacological screening show a significant depressant activity more remarkable in 6-chloro derivatives, which also revealed a high and lasting analgesic activity. The replacement of pyridine with benzene nucleus did not show any significant or homogeneous activity variation.