Abstract
Transition-metal-catalyzed carbonylation with cleavage of a C-H bond is described. The reactions described are (1) carbonylation at the C-H bond α to the ring nitrogen in imidazoles (ii) carbonylation at the C-H bond γ to the ring nitrogen in pyridylbenzenes, aromatic imines, and aryloxazolines (iii) carbonylation at the olefinic C-H bond in pyridylolefines (iv) carbonylation at the sp2 C-H bond in a piperazine ring. Coordination of a directing group such as nitrogen or oxygen functionalities to transition metals, such as ruthenium and rhodium, promotes site selective cleavage of a C-H bond.
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