title: Structure-activity relationships of new muscarinergic dibenzodioxazocines.
abstract: 1H-NMR and X-ray conformation studies of new muscarinergic dibenzodioxazocines have been carried out. It is suggested that EGYT-2347 (2-chloro-12-/2-piperidino-ethyl/-dibenzo [d,g] [1, 3, 6] dioxazocine hydrochloride) may exist in solution in at least two distinct conformations, unlike other tricyclic or non-tricyclic compounds having antimuscarinergic activity. One of these conformations possessing an asymmetric, twisted central hetero-ring confined between two phenyl rings is probably the energetically more stable form, while the other having a butterfly-like structure, with mirror symmetry-related phenyl rings as in phenothiazines seems to be more suitable for receptor binding. The importance of the hydrophobic pocket at the receptor site was revealed by the good correlation of the calculated and measured hydrophobic parameters to the muscarinic activity of these newly synthesized and other known muscarinergic compounds.
authors.affiliation: CHINOIN Pharmaceutical and Chemical Works Co., Ltd., Budapest, Hungary
authors.forename: A
authors.initials: A
authors.lastname: Kálmán
authors.forename: L
authors.initials: L
authors.lastname: Párkányi
authors.forename: K
authors.initials: K
authors.lastname: Valkó
authors.forename: G
authors.initials: G
authors.lastname: Mátrai
authors.forename: J
authors.initials: J
authors.lastname: Batke
authors.forename: J
authors.initials: J
authors.lastname: Gaál
mesh_terms: D003989:Dibenzoxazepines / Q000378:metabolism / Q000494:pharmacology*; D066298:In Vitro Techniques; D007700:Kinetics; D008968:Molecular Conformation; D010276:Parasympatholytics / Q000494:pharmacology; D010277:Parasympathomimetics; D011976:Receptors, Muscarinic / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D003989:Dibenzoxazepines; D010276:Parasympatholytics; D010277:Parasympathomimetics; D011976:Receptors, Muscarinic; C039088:2-chloro-12-(2-piperidinoethyl)dibenzo(d,g)-1,3,6-dioxazocine