[3+2]-Annulation of platinum-bound azomethine ylides with distal CC bonds of N-allenamides

A Pt-catalyzed, highly regioselective reaction between N-allenamides and imino-alkynes leading to pyrrolo[1,2-a]indoles is described. This represents the first example of [3+2]-annulation of Pt-bound azomethine ylides with the distal CC bond of N-allenamides. The mechanism of the reaction was established by computational studies.