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N-Heterocyclic carbene-catalyzed annulation of ynals with amidines: access to 1,2,6-trisubstituted pyrimidin-4-ones
作者:Yangxi Xie、Jian Wang
DOI:10.1039/c8cc02023j
日期:——
A thiazolium-catalyzed annulation of ynals and amidines has been reported to construct pyrimidin-4-ones.
一种噻唑嗪催化的ynals和胺亚胺的环化反应已被报道用于构建嘧啶-4-酮。
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.