Manganese-Catalyzed C-H Functionalizations: Hydroarylations and Alkenylations Involving an Unexpected Heteroaryl Shift.

A manganese-catalyzed regio- and stereoselective hydroarylation of allenes is reported. The C-H functionalization method provides access to various alkenylated indoles in excellent yields. Moreover, a hydroarylation/cyclization cascade involving an unexpected C-N bond cleavage and aryl shift has been developed, which provides a new synthetic approach to substituted pyrroloindolones.