Bioisosteric prototype design of biaryl imidazolyl and triazolyl competitive histamine H2-receptor antagonists
摘要:
The structural relationship of the competitive histamine H2-receptor antagonist 3-amino-5-(2-amino-4-pyridyl)-1,2,4-triazole (1) to the agonist histamine and to antagonists of the cimetidine type was explored by the design and synthesis of four series of bioisosterically designed prototypes. Biological data from these series was best interpreted as indicating a similarity between the imidazole moiety of histamine and cimetidine and the 2-amino-4-pyridyl moiety of 1. On the basis of this data, sequential replacement of 2-amino-4-pyridyl by 2-[(dimethylamino)methyl]-5-furyl and 2-guanidino-4-triazolyl moieties led to a structurally more potent series of biaryl histamine H2-receptor antagonists. The best of these, 2-methyl-4-(2-guanidino-4-thiazolyl)imidazole (29, CP-57,361-1) was 120 times more potent as a histamine H2-receptor antagonist than 1.
derivatives and relatedcompounds were synthesized and evaluated for histamineH2-receptorantagonist and gastric acid antisecretory activities. Among them, compounds I-17, I-48 and I-49 showed high activities in these tests. In addition, compound I-17 possessed potent inhibitory activities on each of the gastric ulcers induced by stress, ethanol and HCl-aspirin. On the other hand, compound I-48 demonstrated
A series of 2-guanidino-4-heteroarylthiazoles, wherein the heteroaryl substituent is selected from thiazolyl, triazolyl, imidazolyl, and 2-alkyl, 2-amino and 2-carboxamido derivatives thereof, are disclosed. The novel compounds have activity as antisecretory agents and histamine H.sub.2 antagonists and are useful for the treatment of gastric hyperacidity and peptic ulcers. Also disclosed are pharmaceutical compositions containing the novel compounds of this invention and a method of using the compounds in the treatment of gastric hyperacidity and peptic ulcers. Novel intermediates useful in the preparation of the novel antisecretory compounds are also described.
A series of 2-guanidino-4-heteroarylthiazoles, wherein the heteroaryl substituent is selected from thiazolyl, triazolyl, imidazolyl, and 2-alkyl, 2-amino and 2-carboxamido derivatives thereof, are disclosed. The novel compounds have activity as antisecretory agents and histamine H.sub.2 antagonists and are useful for the treatment of gastric hyperacidity and peptic ulcers. Also disclosed are pharmaceutical compositions containing the novel compounds of this invention and a method of using the compounds in the treatment of gastric hyperacidity and peptic ulcers. Novel intermediates useful in the preparation of the novel antisecretory compounds are also described.
A series of 2-guanidino-4-heteroarylthiazoles, wherein the heteroaryl substituent is selected from thiazolyl, triazolyl, imidazolyl, and 2-alkyl, 2-amino and 2-carboxamido derivatives thereof, are disclosed. The novel compounds have activity as antisecretory agents and histamine H.sub.2 antagonists and are useful for the treatment of gastric hyperacidity and peptic ulcers. Also disclosed are pharmaceutical compositions containing the novel compounds of this invention and a method of using the compounds in the treatment of gastric hyperacidity and peptic ulcers. Novel intermediates useful in the preparation of the novel antisecretory compounds are also described.