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.