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Oxidative Cyclization Approach to Benzimidazole Libraries
作者:Eric P. Arnold、Prolay K. Mondal、Daniel C. Schmitt
DOI:10.1021/acscombsci.9b00189
日期:2020.1.13
building blocks, providing limited chemical space coverage. We have developed an amidine formation/oxidativecyclization sequence that enables anilines as a diversity set for benzimidazole C4–C7 SAR generation in parallel format. The amidine annulation was achieved using PIDA or Cu-mediated oxidation to access both N–H and N–alkyl benzimidazoles. This library protocol has now been utilized for analog
Access to highly functionalized imidazolones bearing α-amino acid esters <i>via</i> KOH-promoted annulation of amidines, nitrosoarenes and malonic esters
作者:Wenhui Li、Jie Xin、Pingan Zhai、Jianying Lin、Shuangping Huang、Wenchao Gao、Xing Li
DOI:10.1039/d1ob00930c
日期:——
α-amino acid esters through KOH-mediated one-pot three-component annulation of amidines, nitrosoarenes and malonic esters is reported. This reaction features broad substrate scope, a cheap and readily available promoter, good to high yields for most substrates and mild reaction conditions. The mechanism study shows that the KOH-mediated formation of the imine intermediate via the reaction of nitrosoarenes
The first rhodium‐catalyzed oxidative double C−Hactivation/annulation reaction of amidines and alkynes to construct benzimidazoisoquinolines was developed. The operationally simple transformation showed high functional group compatibility and featured the cleavage of the C−H bonds located on a different moiety of the N‐phenylbenzimidamide substrates.
Rhodium(<scp>iii</scp>)-catalyzed oxidative annulation of <i>N</i>-arylbenzamidines with maleimides <i>via</i> dual C–H activation
作者:G. Siva Sankaram、Tanmoy Sahoo、B. Sridhar、B. V. Subba Reddy
DOI:10.1039/d2ob01972h
日期:——
for the first time using a catalytic amount of the [Cp*RhCl2]2 complex for the synthesis of a diverse range of 1H-benzo[4,5]imidazo[2,1-a]pyrrolo[3,4-c]isoquinoline-1,3(2H)-dionederivatives. This method is versatile and atom-economical for producing polycyclic benzo[4,5]imidazo[2,1-a]pyrrolo[3,4-c] isoquinoline-1,3(2H)-dione scaffolds in a single step.
首次使用催化量的 [Cp*RhCl 2 ] 2复合物开发了N -芳基苯甲酰亚胺与马来酰亚胺的氧化环化反应,用于合成各种 1 H -苯并[4,5]咪唑[2] ,1- a ]pyrrolo[3,4- c ]isoquinoline-1,3(2 H )-dione 衍生物。该方法具有通用性和原子经济性,可一步生产多环苯并[4,5]咪唑并[2,1- a ]吡咯并[3,4- c ]异喹啉-1,3(2 H )-二酮支架。