title: Thieno[2,3-b]furan-2-sulfonamides as topical carbonic anhydrase inhibitors.
abstract: Novel 5-[(alkylamino)methyl]thieno[2,3-b]furan-2-sulfonamides were prepared and evaluated in vitro for inhibition of human carbonic anhydrase II (CA II) and ex vivo for their ability to inhibit Ca II in the albino rabbit eye after topical administration. Compound 11a was found to lower intraocular pressure (IOP) in both the alpha-CT ocular hypertensive albino rabbit and the normal albino rabbit, but was ineffective at lowering IOP in a hypertensive, pigmented monkey model. Since 11a was highly bound to ocular pigment, a series of less basic analogs was prepared. Examples in this series were both less extensively bound to ocular pigment and more active at reducing IOP in pigmented rabbits after topical dosing. Key examples displayed moderate reactivity toward glutathione.
authors.affiliation: Merck Research Laboratories, Department of Medicinal Chemistry, West Point, Pennsylvania 19486.
authors.forename: G D
authors.initials: GD
authors.lastname: Hartman
authors.forename: W
authors.initials: W
authors.lastname: Halczenko
authors.forename: J D
authors.initials: JD
authors.lastname: Prugh
authors.forename: R L
authors.initials: RL
authors.lastname: Smith
authors.forename: M F
authors.initials: MF
authors.lastname: Sugrue
authors.forename: P
authors.initials: P
authors.lastname: Mallorga
authors.forename: S R
authors.initials: SR
authors.lastname: Michelson
authors.forename: W C
authors.initials: WC
authors.lastname: Randall
authors.forename: H
authors.initials: H
authors.lastname: Schwam
authors.forename: J M
authors.initials: JM
authors.lastname: Sondey
mesh_terms: D000287:Administration, Topical; D000818:Animals; D002257:Carbonic Anhydrase Inhibitors / Q000737:chemistry / Q000494:pharmacology*; D002256:Carbonic Anhydrases / Q000378:metabolism; D003619:Dansyl Compounds / Q000378:metabolism; D004912:Erythrocytes / Q000201:enzymology; D006801:Humans; D007429:Intraocular Pressure / Q000187:drug effects*; D011817:Rabbits; D012995:Solubility; D013329:Structure-Activity Relationship; D013449:Sulfonamides / Q000138:chemical synthesis / Q000494:pharmacology*
chemical_list: D002257:Carbonic Anhydrase Inhibitors; D003619:Dansyl Compounds; D013449:Sulfonamides; C001026:5-dimethylaminonaphthalene-1-sulfonamide; D002256:Carbonic Anhydrases