77303-08-3Relevant articles and documents
A mild, efficient and one-pot synthesis of 2-substituted benzimidazoles by ZrOCl2. 8H2O catalyzed ring closure reaction
Sanjeeva Reddy,Nagaraj
experimental part, p. 1154 - 1159 (2009/04/11)
A mild, efficient and one-pot synthesis of an array of 2-substituted benzimidazoles from an appropriate o-phenylenediamine and orthoesters such as orthoformate, orthoacetate and orthovalerate using ZrOCl2-8H 2O, at room temperature and under microwave irradiation is described. Ecofriendly, solvent-free methodology has been employed under microwave condition. Compared with the conventional method, microwave irradiation method has the advantages of excellent yields (81-93%) and shorter reaction time (5-10 min).
6-Substituted benzimidazoles as new nonpeptide angiotensin II receptor antagonists: Synthesis, biological activity, and structure-activity relationships
Ries,Mihm,Narr,Hasselbach,Wittneben,Entzeroth,Van Meel,Wienen,Hauel
, p. 4040 - 4051 (2007/10/02)
Starting from the recently reported nonpeptidic angiotensin II (AII) receptor antagonists DuP 753 (1) and Exp 7711 (2), we have designed and investigated novel substituted benzimidazoles. Systematic variation of several substituents at the benzimidazole ring positions 4-7 led to the finding that substitution in position 6 with acylamino groups results in highly active AII antagonists. Compounds with 6-membered lactam or sultam substituents in position 6 of benzimidazole showed receptor activities in the low nanomolar range but were only weakly active when given orally to rats. In contrast, analogous substitution of the benzimidazole moiety with basic heterocycles resulted in potent AII antagonists which were also well absorbed after oral application. The most active compound of this series, 33 (BIBR 277), was selected as a candidate for clinical development. On the basis of molecular modeling studies a binding model of this new class of AII antagonists to the AT1 receptor is proposed.
