Metal assisted synthesis of mono and diamino substituted pyridines

A microwave assisted Buchwald-Hartwig amination protocol is reported for a series of dihalopyridine precursors. Using this procedure, selective substitution of one halogen by aryl or alkylamines is possible in very short time, usually 30 min. Mild base (K₂CO₃) can be used successfully, which broadens the substrate scope. The second halogen can then be substituted using alkylamines under nucleophilic substitution condition or via a Suzuki-Miyaura cross-coupling reaction. The target compounds are potential inducers of cardiomyogenesis as innovative approach in regenerative medicine.