title: Anti-Helicobacter pylori agents. 4. 2-(Substituted guanidino)-4-phenylthiazoles and some structurally rigid derivatives.
abstract: In order to find a new class of anti-Helicobacter pylori (H. pylori) agents, a series of 4-[(3-acetamido)phenyl]-2-(substituted guanidino)thiazoles and some structurally rigid analoges were synthesized and evaluated for antimicrobial activity against H. pylori. Among the compounds obtained, high anti-H. pyrori activities were observed in benzyl derivative 34 (MIC = 0.025 microg/mL) and phenethyl derivatives 35 and 36 (MIC = 0.037 microg/mL and 0.017 microg/mL). Though alkyl derivatives generally showed lower activity, the 2-methoxyethyl derivative 28 preserved significant activity (MIC = 0.32 microg/mL) and also exhibited more potent gastric antisecretory activity than ranitidine. Structural restriction by bridging between the thiazole and the phenyl rings with an alkyl chain did not improve the activity in this series.
authors.affiliation: Medicinal Chemistry Research Laboratories and Medicinal Biology Research Laboratories, Fujisawa Pharmaceutical Company Ltd., 2-1-6, Kashima, Yodogawa-ku, Osaka 532-8514, Japan. yousuke_katsura@po.fujisawa.co.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Katsura
authors.forename: T
authors.initials: T
authors.lastname: Tomishi
authors.forename: Y
authors.initials: Y
authors.lastname: Inoue
authors.forename: K
authors.initials: K
authors.lastname: Sakane
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: C
authors.initials: C
authors.lastname: Morinaga
authors.forename: H
authors.initials: H
authors.lastname: Ishikawa
authors.forename: H
authors.initials: H
authors.lastname: Takasugi
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D005744:Gastric Acid / Q000378:metabolism; D006146:Guanidines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D016480:Helicobacter pylori / Q000187:drug effects*; D006635:Histamine H2 Antagonists / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D008297:Male; D008826:Microbial Sensitivity Tests; D011899:Ranitidine / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D013329:Structure-Activity Relationship; D013844:Thiazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology
chemical_list: C413350:4-(3-(acetamidomethyl)phenyl)-2-((2-methoxyethyl)guanidino)thiazole; D000900:Anti-Bacterial Agents; D006146:Guanidines; D006635:Histamine H2 Antagonists; D013844:Thiazoles; D011899:Ranitidine