derivatives from azobenzenes and tertiary amines. The reaction involves rearrangement of the azobenzene moiety to an N-phenyl-1,2-phenylenediamine intermediate which then undergoes alkylation at nitrogen with an alkyl group from the tertiary amine followed by ring closure and aromatization. Various ruthenium complexes serve as catalyst precursors for the reaction and the presence of carbonmonoxide is required
A Bioinspired Catalytic Aerobic Oxidative CH Functionalization of Primary Aliphatic Amines: Synthesis of 1,2-Disubstituted Benzimidazoles
作者:Khac Minh Huy Nguyen、Martine Largeron
DOI:10.1002/chem.201502487
日期:2015.9.1
AerobicoxidativeCHfunctionalization of primary aliphatic amines has been accomplished with a biomimetic cooperative catalytic system to furnish 1,2‐disubstituted benzimidazoles that play an important role as drug discovery targets. This one‐pot atom‐economical multistep process, which proceeds under mild conditions, with ambient air and equimolar amounts of each coupling partner, constitutes a
Verfahren zur Herstellung von substituierten Benzimidazolen
申请人:CIBA-GEIGY AG
公开号:EP0138750A1
公开(公告)日:1985-04-24
Die Ruthenium- oder Rhodium katalysierte Reaktion von Azobenzolen mit tertiären Aminen, die mindestens eine RCH2-Gruppe aufweisen, oder die Rutheniumkatalysierte Reaktion mit primären Alkoholen bzw. deren Ester aliphatischer Carbonsäuren, führt zu 1-Phenyl-2-substituierten Benzimidazolen.
Flavin photocatalysis were utilised for an aerobic oxidative reaction between arylamines and o-phenylenediamine. This metal-free reaction proceeded in methanol under visible light irradiation and consumed only atmospheric molecular oxygen, providing a novel eco-friendly method for the synthesis of benzimidazoles.
Cobalt(II)-complex catalyzes efficiently the intramolecular C–N and C–O cross-couplings of Z-N′-(2-halophenyl)-N-phenylamidines and N-(2-bromophenyl)benzamides to afford the corresponding substituted benzimidazoles and benzoxazoles in the presence of K2CO3 at moderate temperature. The protocol is general, air stable and affords the products selectively in moderate to high yield.
钴(II)配合物有效催化Z - N '-(2-卤代苯基)-N-苯基am和N-(2-溴苯基)苯甲酰胺的分子内C – N和C – O交叉偶联,提供相应的取代苯并咪唑在中等温度下在K 2 CO 3存在下使用苯并恶唑和苯并恶唑。该方案是一般的,空气稳定的,并且以中等至高收率选择性地提供产物。