- Highly efficient palladium-catalyzed cross-coupling of diarylborinic acids with arenediazoniums for practical diaryl synthesis
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A highly efficient cross-coupling of cost-effective diarylborinic acids with both isolatable and latent arenediazoniums, i.e. tetrafluoroborates and aryltriazenes, respectively, has been developed with a practical palladium catalyst system under base-free conditions in open flask at room temperature. A variety of electronically and sterically various biaryls, in particular, those bearing a coordinative ortho-substituent, could be obtained in good to excellent yields by using 0.3 mol% palladium acetate as catalyst. Features of the protocol including cost-effectiveness of diarylborinic acids, efficacy to heteroatom ortho-substituted substrates and high chemoselectivity to aryl chlorides have been clearly demonstrated in practical synthesis of fungicide Boscalid.
- Wang, Fengze,Wang, Chen,Sun, Guoping,Zou, Gang
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supporting information
(2019/12/25)
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- Synthesis in 3 Azafluorene Group. Part-III
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The Hey-Elks route to arylated pyridines has been utilised in the synthesis of 3-azafluorenes.The pyrido-coumarin (23) and the related chromene (24) have been synthesised.
- Chatterjea, J. N.,Shaw, S. C.,Prasad, Y.,Singh, R. P.
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p. 1028 - 1031
(2007/10/02)
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