Efficient, Rapid and One Pot Synthesis of 2-substituted Benzimidazoles Using the NaOH/I<sub>2</sub> System as an Oxidant Under Mild Conditions
作者:Hossein Naeimi、Nasrin Alishahi
DOI:10.3184/174751913x13636014702351
日期:2013.4
A one-potefficientsynthesis of benzimidazolederivatives has been achieved from aryl aldehydes and o-phenylenediamine in the presence of the NaOH/I2 system at roomtemperature in acetonitrile. The simplicity of the procedure and work-up, larger scale synthesis, high yields and short reaction times are the advantages of this method.
SONICATED ASSISTED SYNTHESIS OF BENZIMIDAZOLES, BENZOXAZOLES AND BENZOTHIAZOLES IN AQUEOUS MEDIA
作者:SANDEEP D PARDESHI、JAYANT P SONAR、SHIVAJI S PAWAR、DEEPAK DEKHANE、SUNIL GUPTA、ASHOK M ZINE、SHIVAJI N THORE
DOI:10.4067/s0717-97072014000100020
日期:——
ABSTRACT Ammonium nickel sulphate [(NH 4 ) 2 SO 4 .NiSO 4 .6H 2 O] was found as a new catalyst to synthesis 2-aryl benzimidazole, 2-aryl benzothiazole and 2-aryl benzoxazole in aqueous media under sonication irradiation. The procedure is an eco-friendly, efficient and provides simple workup and good yield. Keywords : - Benzimidazole, benzothiazole, benzoxazole, aqueous media, sonication, ammonium nickel
摘要发现硫酸铵镍[(NH 4)2 SO 4 .NiSO 4 .6H 2 O]是在水介质中超声辐照下合成2-芳基苯并咪唑,2-芳基苯并噻唑和2-芳基苯并恶唑的新催化剂。该过程是环保,高效的,并且提供简单的后处理和良好的产率。关键词:-苯并咪唑,苯并噻唑,苯并恶唑,水介质,超声处理,硫酸铵镍。电子邮件:snthore@rediffmail.com简介苯并咪唑,苯并恶唑和苯并唑是重要的杂环核,已广泛用于药物化学1,2。这些杂环是药物开发中重要的药效团3,4和许多重要有机化合物合成中的良好中间体5。这些杂环化合物具有不同的药理特性,例如抗菌6,抗病毒7,
Substrate-controlled Rh(<scp>iii</scp>)-catalyzed regiodivergent annulation towards fused and spiro benzimidazoles
作者:Ying-Ti Huang、Indrajeet J. Barve、Yi-Ting Huang、Sandip Dhole、Wei-Jung Chiu、Chung-Ming Sun
DOI:10.1039/d2ob00906d
日期:——
Mechanistically, C–H activation followed by migratory insertion of maleimide forms a Heck-type intermediate. Unsubstituted benzimidazole undergoes aza-Michael addition to form a (4 + 2) fused product, whereas ortho-substituted phenyl benzimidazole causes steric clash to deliver a (4 + 1) spiro-adduct favorably via acid-catalyzed intramolecular annulation.
Direct synthesis of benzimidazoles by Pd(II) N^N^S-pincer type complexes via acceptorless dehydrogenative coupling of alcohols with diamines
作者:Pennamuthiriyan Anandaraj、Rengan Ramesh、Jan Grzegorz Malecki
DOI:10.1016/j.jorganchem.2022.122577
日期:2023.2
geometry of the synthesized complexes 1 and 2 was confirmed by single-crystal X-ray diffraction study. A wide range of benzimidazole derivatives (32 examples) up to 94% isolated yield has been derived via acceptorlessdehydrogenative coupling of primary alcohols with derivatives of o-phenylenediamines. The present protocol operates smoothly with only 1 mol% catalyst loading. Furthermore, the mechanistic
Substrate-Controlled Divergent Synthesis of Benzimidazole-Fused Quinolines and Spirocyclic Benzimidazole-Fused Isoindoles
作者:Ying-Ti Huang、Wan-Wen Huang、Yi-Ting Huang、Hong-Ren Chen、Indrajeet J. Barve、Chung-Ming Sun
DOI:10.1021/acs.joc.4c00164
日期:2024.6.7
α-diazo carbonyl compounds via C–H activation/carbene insertion/intramolecular cyclization is explored. The switchable product selectivity is achieved by the use of distinct α-diazo carbonyl compounds. Benzimidazole-fused quinolines are obtained through [4 + 2] annulation exclusively when 2-diazocyclohexane-1,3-diones are used, where they act as a C2 synthon. Alternatively, diazonaphthalen-1(2H)-ones