title: 7-(N-substituted)amino-2,3-polymethylene benzofurane derivatives with tracheal relaxant activity.
abstract: A set of twelve 7-(N-substituted)amino-2,3-polymethylenebenzofuranes (1-12) together with three related compounds (13-15) was prepared. Ten selected compounds were tested for tracheal relaxant activity in vitro and two of them (6,7) were also subjected to a broad pharmacological screening. Five compounds (2,7,9,12,14) at the concentration of 30 micrograms/ml exhibited high tracheal relaxant activity (73-94% tone reduction) that was superior than that of theophylline at the same concentration. The 7-(N-trifluoromethylsulfonyl)amino-2,3-tetramethylenebenzofuran e (9) was highly active till the concentration of 1 microgram/ml giving a stronger tracheal relaxation than amrinone at 3 micrograms/ml. On the other hand the general screening did not show any other major activity. The benzofurane derivatives 1-13 were obtained through obvious steps from the corresponding 7-nitrobenzofuranes, which were prepared by a Fischer indole-like cyclization of O-[(2-nitro)phenyl] ketone oximes. In one case two peculiar side products were isolated.
authors.affiliation: Istituto di Scienze Farmaceutiche, Università di Genova, Italy.
authors.forename: I
authors.initials: I
authors.lastname: Vazzana
authors.forename: F
authors.initials: F
authors.lastname: Sparatore
mesh_terms: D000818:Animals; D001572:Benzofurans / Q000737:chemistry / Q000494:pharmacology*; D015394:Molecular Structure; D009126:Muscle Relaxation; D051381:Rats; D014132:Trachea / Q000187:drug effects*
chemical_list: D001572:Benzofurans