title: Studies on the chemistry of thienoannelated O,N- and S,N-containing heterocycles. Part 19: thieno[2,3-b][1,4]thiazines with calcium antagonistic and potassium opening activities.
abstract: In this study novel substituted 6-benzyl-thieno[2,3-b][1,4]thiazines with an urea moiety were synthesized. Structural modifications of the amino side chain were carried out with the aim of finding tissue specific compounds. The effects on papillary muscles, right atria, aortic strips, and terminal ilea were investigated. Compounds 10c and 10d showed the most potent negative inotropic effect. The calcium antagonism of all derivatives occurred in a non-competitive manner, which may indicate that they also have potassium channel opening activities.
authors.affiliation: Institute of Pharmaceutical Chemistry, University of Vienna, Austria.
authors.forename: T
authors.initials: T
authors.lastname: Erker
authors.forename: M E
authors.initials: ME
authors.lastname: Schreder
authors.forename: C
authors.initials: C
authors.lastname: Studenik
mesh_terms: D000818:Animals; D001011:Aorta / Q000187:drug effects; D002121:Calcium Channel Blockers / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D006168:Guinea Pigs; D006325:Heart Atria / Q000187:drug effects; D007082:Ileum / Q000187:drug effects; D066298:In Vitro Techniques; D009682:Magnetic Resonance Spectroscopy; D010210:Papillary Muscles / Q000187:drug effects; D015221:Potassium Channels / Q000187:drug effects*; D013843:Thiazines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D002121:Calcium Channel Blockers; D015221:Potassium Channels; D013843:Thiazines