57610-38-5Relevant academic research and scientific papers
Alkylation of azoles: Synthesis of new heterocyclic-based AT1- non-peptide angiotensin (II) receptor antagonists
Al-Azmi, Amal,George, Paulson,El-Dusouqui, Osman M. E.
, p. 515 - 520 (2008/09/16)
(Chemical Equation Presented) Several novel analogues of Losartan 2 were synthesized as potential non-peptide angiotensin (II) receptor antagonists. In these non-peptide analogues, the tetrazole and the substituted imidazole rings of Losartan 2 were replaced, respectively, by a carboxylic acid function or its methyl ester and substituted triazole, imidazole or benzimidazole moieties. The biphenyl bromide precursor 3 (BPE) used to introduce the linker between the acid/ester function and the heterocyclic moiety was synthesized using Suzuki biphenyl coupling and then incorporated into the target molecule by simple nucleophilic substitution. The fixed N-aryl isomeric forms of several azole and benzimidazole tautomers were successfully separated by HPLC using 50% aqueous acetonitrile as eluent. Intermediate reaction products and final target compounds were fully characterized spectroscopically.
Novel 2H-1,2,3-Triazole sodium complex from N-[2-amino-1,2-dicyanovinyl]alkanamides
AL-Azmi, Amal,George, Paulson,El-Dusouqui, Osman M.E.
, p. 2183 - 2201 (2008/09/17)
Diazotization at 0 °C of N-[2-amino-1,2-dicyanovinyl]ethanamide 2a or propanamide 2b prepared from diaminomaleonitrile (DAMN) 1 using aqueous acetic acid and NaNO2 solution furnished sodium complex 3. The X-ray structure of the complex 3 showed that it is a 1:1 mixture of the neutral 2H-triazole heterocycle 4ii and its anion deprotonated at the central (N) atom of the ring, together with a sodium counter ion and two coordinated water molecules. However, when the diazotization reaction was carried out in the presence of aqueous HCl, the product was 5-cyano-2H-[1,2,3]triazole-4-carboxylic acid amide monohydrate 4ii. Diazotization of DAMN 1 using aqueous HCl furnished 1H-1,2,3-triazole-4,5-dicarbonitrile 5, whereas with acetic acid there was no reaction, and hence no route analogous to that leading to complex 3. The structure of both complex 3 and the triazole monohydrate 4ii were solved using X-ray crystallography, and the compounds under study were fully characterized using spectroscopic techniques.
ANGIOTENSIN II ANTAGONIST 1-BIPHENYLMETHYLIMIDAZOLE COMPOUNDS AND THEIR THERAPEUTIC USE
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, (2008/06/13)
Compounds of the following formula (I) or the formula (I) p : STR1 wherein R 1 is alkyl or alkenyl; R 2 and R 3 are hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl, aryl, or aryl fused to cycloalkyl; R 4 is hydrogen, alkyl, alkanoyl, alkenoyl, arylcarbonyl, alkoxycarbonyl, tetrahydropyranyl, tetrahydrothiopyranyl, tetrahydrothienyl, tetrahydrofuryl, a group of formula--SiR a R b R c, in which R a, R b and R c are alkyl or aryl, alkoxymethyl, (alkoxyalkoxy)methyl, haloalkoxymethyl, aralkyl, aryl or alkanoyloxymethoxycarbonyl; R 5 is carboxy or--CONR 8 R 9, wherein R 8 and R 9 hydrogens or alkyl, or R 8 and R 9 together form alkylene; R 6 is hydrogen, alkyl, alkoxy or halogen; R. sup.7 is carboxy or tetrazol-5-yl; R p. sup.1 is hydrogen, alkyl, cycloalkyl or alkanoyl; R p 2 is a single bond, alkylene or alkylidene; R p 3 and R p 4 are each hydrogen or alkyl; R. sub.p 6 is carboxy or tetrazol-5-yl; and X p is oxygen or sulfur; and pharmaceutically acceptable salts and esters thereof. The compounds are AII receptor antagonists and thus have hypotensive activity and can be used for the treatment and prophylaxis of hypertension. The compounds may be prepared by reacting a biphenylmethyl compound with an imidazole compound.
Nonpeptide angiotensin II receptor antagonists: Synthesis, biological activities, and structure - Activity relationships of imidazole-5-carboxylic acids bearing alkyl, alkenyl, and hydroxyalkyl substituents at the 4-position and their related compounds
Yanagisawa, Hiroaki,Amemiya, Yoshiya,Kanazaki, Takuro,Shimoji, Yasuo,Fujimoto, Koichi,Kitahara, Yoshiko,Sada, Toshio,Mizuno, Makoto,Ikeda, Masahiro,Miyamoto, Shuichi,Furukawa, Youji,Koike, Hiroyuki
, p. 323 - 338 (2007/10/03)
A series of imidazole-5-carboxylic acids bearing alkyl, alkenyl, and hydroxyalkyl substituents at the 4-position and their related compounds were prepared and evaluated for their antagonistic activities to the angiotensin II (AII) receptor. Among them, the 4-(1-hydroxyalkyl)-imidazole derivatives had strong binding affinity to the AII receptor and potently inhibited the AII-induced pressor response by intravenous administration. Various esters of these acids showed potent and long-lasting antagonistic activity by oral administration. The most promising compounds were (5-methyl-2-oxo-1,3-dioxol-4-yl)methyl (CS-866) and (pivaloyloxy)-methyl esters of 4-(1-hydroxy-1-methylethyl)-2-propyl-1-[(2′-1H-tetrazol-5-ylbiphenyl-4-yl) -methyl]imidazole-5-carboxylic acid (26c). A study involving stereochemical comparison of 26c with the acetylated C-terminal pentapeptide of AII was also undertaken.
