Synthesis of Functionalized Ferrocene Derivatives from Donor−Acceptor Cyclopropanes

The TfOH‐catalyzed reaction of aryl‐substituted donor–acceptor cyclopropane derivatives with ferrocene provided new functionalized ferrocene derivatives. This process exhibited a reasonable scope with respect to the cyclopropane component affording the corresponding alkylated ferrocene derivatives in useful yields. An alternative approach to these functionalized ferrocene derivatives involving arylation of a ferrocene‐decorated donor–acceptor cyclopropane derivative is also disclosed. Both processes rely on a facile regioselective ring‐opening of the donor−acceptor cyclopropane.