Design and synthesis of fused tetrahydroisoquinoline-iminoimidazolines.

In the aim of identifying new privileged structures, we describe the 5-steps synthesis of cyclic guanidine compounds "tetrahydroisoquinoline-iminoimidazolines" derived from tetrahydroisoquinoline-hydantoin core. In order to evaluate this new minimal structure and the impact of replacing a carbonyle by a guanidine moiety, their affinity towards adenosine receptor A2A was evaluated and compared to those of tetrahydroisoquinoline-hydantoin compounds.