Synthesis of Novel Succinamide Derivatives Having a 5,11-Dihydro-6H-pyrido(2,3-b)(1,4)benzodiazepin-6-one Skeleton as Potent and Selective M2 Muscarinic Receptor Antagonists. II
A series of succinamide derivatives containing the 5,11-dihydro-6H-pyrido[2,3-b][1,4]benzodiazepin-6-one skeleton (6a-z) was prepared and evaluated for binding affinity to muscarinic receptors in vitro and for antagonism of bradycardia and salivation in vivo in comparison with AF-DX 116 (1a). Structure-activity relationships (SAR) studies in vitro indicated that the 4-(4-alkyl-1-piperazinyl)benzylamino