Journal of the American Chemical Society, Vol.135, No.8, 2947-2950, 2013
Synthesis of Primary and Secondary Alkylboronates through Site-Selective C(sp(3))-H Activation with Silica-Supported Monophosphine-Ir Catalysts
The site-selective activation and borylation of unactivated C(sp(3))-H bonds in 2-alkylpyridines to form primary and secondary alkylboronates was achieved using silica-supported monophosphine-Ir catalysts. This borylation occurs selectively at C-H bonds located gamma to the pyridine nitrogen atom. The site-selectivity of this reaction suggests that the C-H bond cleavage occurs with the assistance of a proximity effect due to N-to-Ir coordination.