give a series of functionalized pyrrolinones 7 via N-ylide complexes 2. The X-ray structure of 7b originating from a ring-opening reaction could be established. When this sequence was applied to the aminocarbene complex 8 bearing a tethered triple bond, synthesis of functionalized 2-oxohexahydroindole 11 was achieved. In the case of acetic acid, products resulting from a formal protonation/hydride addition