55075-94-0Relevant academic research and scientific papers
“On-Water” Palladium-Catalyzed Tandem Cyclization Reaction for the Synthesis of Biologically Relevant 4-Arylquinazolines
Yuan, Shuo,Yu, Bin,Liu, Hong-Min
, p. 13109 - 13113 (2019)
The quinazoline scaffold is prevalent in pharmaceutically relevant molecules that show diverse biological activities. Herein, we report an efficient “on-water” palladium-catalyzed tandem cyclization reaction from commercially available arylboronic acids and benzonitriles that enable the rapid access to 4-arylquinazoline scaffolds in good to excellent yields (45 examples, up to 98 % yield). This protocol has shown good functional group tolerance and broad substrate scope. The reaction was also performed on a gram scale and successfully applied to the synthesis of the highly potent and selective PI3Kδ inhibitor N11, showing the practicability and synthetic utility of the protocol. In this reaction, the quinazoline scaffold is efficiently constructed with the simultaneous formation of one C?C bond and one C?N bond. Collectively, the protocol could serve as an alternative strategy to synthesize biologically important quinazoline scaffolds.
4-arylquinazoline compounds and preparation method thereof
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Paragraph 0050-0053, (2019/09/17)
The invention provides 4-arylquinazoline compounds which have a general formula as shown in the specification, wherein R represents hydrogen, halogen, alkane, nitro or alkoxy, R represents hydrogen or methyl, Ar represents groups as shown in the specification, and R represents hydrogen, halogen, alkane, alkoxy, nitro, hydroxy, trifluoromethyl, phenyl or methoxycarbonyl; the compounds enrich the structures of 4-arylquinazoline compounds, and provide a material basis for further study on the potential biological activity of the compounds. The invention also provides a preparation methodof the compounds, which comprises the following step: cyanophenyl raw materials react with aromatic phenylboronic acid ArB(OH)2 in a sealed environment under the action of a palladium salt catalyst,a bidentate chelating ligand, a Lewis acid and a solvent at 30-300 DEG C to form the 4-arylquinazoline compounds; a structural formula of the 4-arylquinazoline compounds is shown in the specification,and the preparation method provided by the invention has the advantages of no need of inert gas protection, mild reaction conditions, short reaction time, high yield and the like.
