In Vitro Studies on Physiological and Chemical Stability of New LE404-Derivatives with Extended Half-Life.

Dibenzoazecines are a class of potential neuroleptics with high affinity to dopamine and serotonin receptors. The efficacy and high therapeutic range has already been demonstrated in vivo with the lead structure 7-methyl-5,6,7,8,9,14-hexahydrodibenzo[d,g]azecin-3-ol (LE404: ) and selected derivatives. There is a variety of new synthesized structurally different dibenzoazecine derivatives with the aim to improve pharmacokinetic parameters, all of which contain the lead structure LE404: . For a multitude of these substances is still a lack of information, inclusive of stability, physicochemical parameters, pharmacokinetics and metabolism. Therefore, the present study investigated the stability properties of 17 new azecine derivatives, including esterase cleavage, stability in simulated gastrointestinal fluid, stability at different pH-values and determination of octanol/water-partition coefficients. These findings, in correlation to the properties and efficacy of the already in vivo tested substances, will be useful for safety and efficacy in further in vivo tests.