- Synthesis, characterization and biological evaluation of benzimidazole and benzindazole derivatives as anti-hypertensive agents
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A substituted benzimidazole and benzindazole derivatives had been synthesized having antihypertensive activity through antagonizing the angiotensin II (Ang II) receptors. The in vivo antihypertensive activity of the compounds was done with acute renal hypertension model. Two compounds TG 1 and TG 3 were found to have antihypertensive activity comparable to Telmisartan which is a prototype for Angiotensin II receptor antagonists class of drugs.In an antihypertensive study the compounds TG 1, TG 2 and TG 3 had systolic blood pressures of 147.2 mm/Hg, 168.2 mm/Hg, and 126.3 mm/Hg, respectively. This systolic blood pressure was lower than the disease control vehicle-treated rodents, which had a systolic blood pressure of 167.2 mm/Hg. The diastolic blood pressure was 119.7 mm/Hg, 124.7 mm/Hg and 88.83 mm/Hg, respectively and that of the disease control vehicle-treated rodents was 122.3 mm/Hg. TG 3 had comparable decrease in the MABP to Telmisartan. These encouraging results make compound TG 3 effective anti-hypertensive drug candidate and worthy of further investigation.
- Silky, Sethy,Mandal, Sudip Kumar,Ewies, Ewies Fawzy,Neerupma, Dhiman,Arun, Garg
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p. 3659 - 3664
(2021/07/10)
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- Palladium-catalyzed electrophilic C–H fluorination of arenes using oxazoline as a removable directing group
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Dimethyloxazoline was rationally designed to act as a removable ortho-directing group (DG) for the palladium-catalyzed C–H electrophilic fluorination of arenes. Using NFSI as the fluorinating agent, and Pd(II), Ag(I) catalytic system, electrophilic C(sp2–H) ortho-fluorination took place on a variety of aryl substrates to afford the corresponding mono- and di-fluorinated products.
- Gutierrez, David A.,Lee, Wan-Chen Cindy,Shen, Yuning,Li, Jie Jack
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supporting information
p. 5372 - 5376
(2016/11/11)
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- Improved synthesis of valsartan via nucleophilic aromatic substitution on aryloxazoline
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A highly efficient approach to the synthesis of the angiotensin II receptor antagonist valsartan (Diovan), one of the most important agents used in antihypertensive therapy today is described. The formation of the aryl-aryl bond represents the key step of its synthesis, which has been done by simple nucleophelic aromatic substitution on aryloxazoline with good yield and purity. Copyright Taylor & Francis Group, LLC.
- Ghosh, Samir,Kumar, A. Sanjeev,Soundararajan,Mehta
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body text
p. 3880 - 3887
(2009/12/24)
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- Synthesis and X-ray crystal structure of 1,4-dihydro-2,6-dimethyl-4-(2'-isopropylphenyl)-3,5-pyridine-dicarboxy lic acid dimethyl ester: A nifedipine analogue
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We report the synthesis and X-ray crystal structure of 1,4-dihydro-2,6-dimethyl-4-(2'-isopropylphenyl)-3,5-pyridine-dicarboxy lic acid dimethyl ester (4), an analogue of the 1,4-dihydropyridine calcium channel antagonist, nifedipine. Solution state NOE data indicate the presence of both rotameric forms. The solid state shows exclusively one rotamer of 4 (that in which the 2'-isopropyl substituents is syn with C4H, which is also the major solution state rotamer). The 3,5-methyl esters adopt an ap/sp orientation with respect to the dihydropyridine double bonds in the solid state.
- Palmer, Robert B.,Andersen, Niels H.
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p. 2173 - 2176
(2007/10/03)
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- A facile one stage synthesis of oxazolines under microwave irradiation
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A rapid, high yielding procedure for the synthesis of 2-substituted oxazolines has been achieved under microwave irradiation from alkyl and aryl nitriles and β-amino alcohols using a mild Lewis acid catalyst.
- Clarke, David S.,Wood, Robin
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p. 1335 - 1340
(2007/10/03)
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- Nonpeptide angiotensin II receptor antagonists. I. Synthesis and biological activity of pyridine derivatives
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Substituted pyridines were synthesized as potential angiotensin II (AII) receptor antagonists. Substitution at the position 2 in the pyridine resulted in potent activity, and the optimal alkyl length was four carbons. The potency further increased with the introduction of a hydroxymethyl group at the position 4. One of the compounds, 2-butyl-6-chloro-4-hydroxymethyl-5-methyl-3-[[2'-(1H-tetrazol-5-yl)bip henyl-4-yl]methyl]pyridine 9 h (KT3-579)is a competitive AII antagonist with a pA2 value of 9.31, and is about 10 times more potent than Du Pont 753. It was found to be an AT1 specific antagonist with an IC50 of 3.09 nM.
- Ueyama,Yanagisawa,Kawai,Sonegawa,Baba,Mochizuki,Kosakai,Tomiyama
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p. 1841 - 1849
(2007/10/02)
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- ANGIOTENSIN II RECEPTOR BLOCKING IMIDAZOLES
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Substituted imidazoles such as STR1 are useful as angiotensin II blockers. These compounds have activity in treating hypertension and congestive heart failure.
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- Treatment of congestive heart failure with angiotensin 11 receptor blocking imidazoles
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Substituted imidazoles such as STR1 are useful as angiotensin II blockers. These compounds have activity in treating hypertension and congestive heart failure.
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- Nonpeptide Angiotensin II Receptor Antagonists: The Discovery of a Series of N-(Biphenylylmethyl)imidazoles as Potent, Orally Active Antihypertensives
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A new series of nonpeptide angiotensin II (AII) receptor antagonists has been prepared.These N-(biphenylylmethyl)imidazoles, e.g. 2-butyl-1--4-chloro-5-(hydroxymethyl)imidazole, differ from the previously reported N-(benzamidobenzyl)imidazoles and related compounds in that they produce a potent antihypertensive effect upon oral administration; the earlier series generally were active only when administered intravenously.It has been found that the acidic group at the 2'-position of the biphenyl is essential.Only ortho-substituted acids possess both high affinity for the AII receptor and good oral antihypertensive potency.The carboxylic acid group has been replaced with a variety of acidic isosteres, and the tetrazole ring has been found to be the most effective.The tetrazole derivative, DuP 753, is currently in development for the treatment of hypertension.
- Carini, David J.,Duncia, John V.,Aldrich, Paul E.,Chiu, Andrew T.,Johnson, Alexander L.,et al.
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p. 2525 - 2547
(2007/10/02)
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