We present an experimental study of N unidirectionally coupled Mackey-Glass electronic circuits with time delay in a ring configuration. When the output of the ring is sent to a chain of N/2 oscillators, identical synchronization is observed between pairs of corresponding elements in the ring and chain. The novelty of the presented proposal resides on the fact that distant elements in the ring and the chain can synchronize via an uncorrelated signal generated by a mediator element. For the sake of completeness, we also present numerical results with rings of several numbers of oscillators and provide a possible application for chaos key distribution.