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.
FeCl<sub>3</sub>-Assisted Niobium-Catalyzed Cycloaddition of Nitriles and Alkynes: Synthesis of Alkyl- and Arylpyrimidines Based on Independent Functions of NbCl<sub>5</sub>and FeCl<sub>3</sub>Lewis Acids
作者:Maito Fuji、Yasushi Obora
DOI:10.1021/acs.orglett.7b02708
日期:2017.10.20
NbCl5-catalyzed [2 + 2 + 2] cycloaddition of nitriles with alkynes was used to synthesize pyrimidine derivatives. In this reaction, the use of individual Lewis acids, namely NbCl5 and FeCl3, is a key strategy for achieving the reaction using a catalytic amount of NbCl5. The roles of the two Lewis acids were investigated using FT-IR spectroscopy. The results showed that NbCl5 served as an efficient
activation of secondaryamides in the presence of alkynes. An unusual mechanistic detour leading to pyridine derivatives as products is also presented and briefly discussed. In this article we describe the straightforward synthesis of polysubstituted pyrimidines by electrophilic activation of secondaryamides in the presence of alkynes. An unusual mechanistic detour leading to pyridine derivatives as products
Cooperative ruthenium complex catalyzed multicomponent synthesis of pyrimidines
作者:Milan Maji、Sabuj Kundu
DOI:10.1039/c9dt04040d
日期:——
air and moisture stable rutheniumcomplexes were synthesized and characterized. The catalytic behaviors of these complexes were evaluated towards the multicomponent synthesis of highly substituted pyrimidines directly from various amidines, primary alcohols, and secondary alcohols. Among all the metal complexes, 2-hydroxypyridine and benzimidazole fragments containing complex A showed the best reactivity
Flow reactor approach for the facile and continuous synthesis of efficient Pd@Pt core-shell nanoparticles for acceptorless dehydrogenative synthesis of pyrimidines from alcohols and amidines
Carbonsupported Pd@Pt core-shellnanoparticles catalyst was prepared in a flow reactor toachieve enhanced catalyticactivities with low Pt loading for the acceptorless dehydrogenative synthesis of pyrimidines. Spectroscopic (XAS analysis) and microscopic (HAADF-STEM) techniques reveled that the core-shell structure was formed by the applied preparation method. The Pd@Pt/PVP (polyvinylpyrrolidone)/C