Regioselective Syntheses of 2,7-(Het)arylpyrido[2,3-d]pyrimidines by an Orthogonal Cross-Coupling Strategy. -Two sequential cross-coupling reactions of substrate (I) with arylboronic acids allow the approach to the desired target compounds. Monoarylated heterocycles (IIIa) and (IIIb) are most suitable in the process, whereas no reaction takes place in the presence of a pyridyl substituent [cf. (IIId)]. -(MAINGOT, L.; DEHBI, O.; BURON, F.; AADIL, M.; AKSSIRA, M.; ROUTIER, S.; GUILLAUMET*, G.; Synlett 2012, 17, 2449-2452, http://dx.
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