- Regioselective alkylation of 2-alkyl-5,6,7,8-tetrahydro-3H- cycloheptimidazol-4-ones and 2-alkyl-3H-cycloheptimidazol-4-ones
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Regioselective alkylation of 2-alkyl-5,6,7,8-tetrahydro-3H- cycloheptimidazol-4-one (1) and 2-alkyl-3H-cycloheptimidazol-4-one (2) was investigated. 3-[2′-(1-tert-Butyl-1H-tetrazol-5-yl)biphenyl-4-ylmethyl]-2- propyl-5,6,7,8-tetrahydro-1H-cycloheptimidazol-4-one (6) was preferentially obtained under the conditions by using NaH in DMF or THF. On the other hand, 3-[2′-(1-tert-butyl-1H-tetrazol-5-yl)biphenyl-4-ylmethyl]-2-propyl-5,6,7, 8-tetrahydro-3H-cycloheptimidazol-4-one (5), the synthetic intermediate compound of Pratosartan, was obtained selectively in the presence of n-Bu4NBr in toluene by using aqueous sodium hydroxide as a base. In this reaction, it was found that the concentration of the alkaline solution influences its regioselectivity. This selectivity was observed even for aldehyde and ester derivatives.
- Sonegawa, Motoharu,Yokota, Masayuki,Tomiyama, Hiroshi,Tomiyama, Tsuyoshi
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- Design, synthesis and antimicrobial evaluation of novel 1-benzyl 2-butyl-4-chloroimidazole embodied 4-azafluorenones via molecular hybridization approach
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A series of novel 1-benzyl-2-butyl-4-chloroimidazole embodied 4-azafluorenone hybrids, designed via molecular hybridization approach, were synthesized in very good yields using one pot condensation of 1-benzyl-2-butyl-4-chloroimidazole-5-carboxaldehyde, 1
- Addla, Dinesh,Bhima,Sridhar, Balasubramanian,Devi, Anjana,Kantevari, Srinivas
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p. 7475 - 7480
(2013/02/22)
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- Potent Nonpeptide Angiotensin II Receptor Antagonists. 2. (1-Carboxybenzyl)imidazole-5-acrylic Acids
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The further evolution of the imidazole-5-acrylic acid series of nonpeptide angiotensin II receptor antagonists is detailed (for Part 1, see: J.Med.Chem. 1992, 35, 3858).Modifications of the N-benzyl ring substitution were undertaken in an effort to mimic the Tyr4 residue of angiotensin II.Introduction of a p-carboxylic acid on the N-benzyl ring resulted in the discovery of compounds with nanomolar affinity for the receptor and good oral activity.SAR studies of these potent antagonists revealed that the thienyl ring, the (E)-acrylic acid, and the imidazole ring in addition to the two acid groups were important for high potency.Also, overlay comparisons of the parent diacid with both angiotensin II and a representative biphenylyltetrazole nonpeptide angiotensin II receptor antagonist are presented.The parent diacid analog, SKF 108566 or (E)-3--2-propenoic acid, is currently in clinical development for the treatment of hypertension.
- Keenan, Richard M.,Weinstock, Joseph,Finkelstein, Joseph A.,Franz, Robert G.,Gaitanopoulos, Dimitri E.,et al.
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p. 1880 - 1892
(2007/10/02)
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