A novel ring transformation of pyridinium salts as a route to 4-arylpyridinesстатья
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Аннотация:Regiospecific phenylation of pyridine derivatives at the 4-position takes place in the reaction of 4-methylpyridinium salts 1 with other pyridinium salts 2 by intermolecular transformation of the pyridine ring in 1 and participation of the methyl group of 2. The method developed makes it possible to carry out ring transformation not only for pyridinium salts 1 but even for pyridine itself. 4-Phenylpyridine (3) was produced in 29-57% yields. The new reaction proceeds in an aqueous medium on heating and on treatment with methylammonium sulfite. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2002).