N-Metallocenyl Ynamides: Preparation, Reactivity, and Synthesis of ansa[3]-Ferrocenylamides

The first synthesis of various N-metallocenyl ynamides has been developed, and two strategies for the oxidative cyclization of N-ferrocenyl ynamide into ansa[3]-ferrocenylamide are also reported. The mechanism for the iodine(III)-triggered transformation has been studied by means of DFT calculations, showing that it proceeds through a concerted iodination deprotonation step.