Parallel solution- and solid-phase synthesis of spiropyrrolo-pyrroles as novel neurokinin receptor ligands.

The combination of a 3,5-bis(trifluoromethyl)phenyl needle with the spiropyrrolo-pyrrole motive as a privileged GPCR scaffold was the basis for designing a focused combinatorial library targeted towards the neurokinin-1 receptor. A solution- and solid-phase method is described and binding affinities of representative compounds are presented.