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For an excellent review on catalyst systems used in Suzuki-Miyaura couplings conducted in aqueous media and using microwave irradiation, see references [4d] and [4e], and references therein.
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Our attempts to effect the coupling of 2-bromomesitylene with 2,6-dimethylphenylboronic acid in water at 100°C to form a biaryl with four substituents ortho to the aryl-aryl connection provided none of the desired product. This is in contrast to what is observed with a catalytic system using 1. See ref. [2c].
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15044358619
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The authors report that monodentate phosphines are poor ligands for the Suzuki-Miyaura coupling of 2-amino-pyridines and pyrimidines. This result suggests that use of a highly active catalyst system such as Pd/2 at least in some instances overcomes this limitation; see: T. Itoh, T. Mase, Tetrahedron Lett. 2005, 46, 3573.
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Choice of the palladium source and ligands 2 and 4 was made on the basis of our previous reports. See references [3] and [20].
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49
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