Mechanistic insight into the azo radical-promoted dehydrogenation of heteroarene towards N-heterocycles
作者:Amreen K. Bains、Debashis Adhikari
DOI:10.1039/d0cy01008a
日期:——
reactions to synthesize wide variety of N-heterocycles. In these processes, the dehydrogenation of saturated heteroarenes in the late stage is generally required to furnish the desired N-heterocycle. However, in a one-pot, multistep heterocycle synthesis, this step is not well elucidated, and the role of the catalyst is not thoroughly understood. Furthermore, the use of copious amount of base at elevated
Transition-metal-free selective pyrimidines and pyridines formation from aromatic ketones, aldehydes and ammonium salts
作者:Jinjin Chen、Huanxin Meng、Feng Zhang、Fuhong Xiao、Guo-Jun Deng
DOI:10.1039/c9gc02077b
日期:——
An efficient synthesis of pyrimidines and pyridines has been developed from readily available aromaticketones, aldehydes and ammonium salts under transition-metal-free conditions. In this strategy, ammonium salts were used as nitrogen sources and only water was generated as a nontoxic byproduct. A catalytic amount of NaIO4 played an important role in the selectivity control, whereas substituted pyridines
Base-Mediated Three-Component Tandem Reactions for the Synthesis of Multisubstituted Pyrimidines
作者:Dongqing Liu、Wei Guo、Wanqing Wu、Huanfeng Jiang
DOI:10.1021/acs.joc.7b02113
日期:2017.12.15
A base-mediated three-component tandem reaction for the synthesis of multisubstituted pyrimidines from amidines, aryl alkynes, and aldehydes in a one-pot manner has been developed. Advantages of this transformation include being transition-metal-free, high efficiency, available starting materials, and being environmentally friendly.
Copper-catalyzed three-component synthesis of pyrimidines from amidines and alcohols
作者:Tianchao Shi、Feng Qin、Qian Li、Wu Zhang
DOI:10.1039/c8ob02694g
日期:——
An efficient copper-catalyzed one-pot three-component reaction of amidines, primary alcohols and secondary alcohols has been developed to synthesize multisubstituted pyrimidines. The significant merits of this method involve high atom efficiency, good functional group tolerance and operational simplicity.