The addition of substituted anilines to nitro-substituted isocyanates followed by reduction generates new aniline-substituted ureas, which can be further extended in a one- or two-directional iterative manner to form oligomeric ureas based on a m-phenylenediamine monomer. Oligo-ureas with up to eight urea linkages are reported. Fully N-substituted oligo-ureas are crystalline, and the X-ray crystal structures display ring-stacked conformations. H-1 NMR studies indicate that the stacked conformation persists in solution.
[EN] NOVEL VANILLOID RECEPTOR MODULATORS, PROCESS FOR THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM<br/>[FR] NOUVEAUX MODULATEURS DE RÉCEPTEUR VANILLOÏDE, PROCÉDÉ POUR LEUR PRÉPARATION ET COMPOSITIONS PHARMACEUTIQUES CONTENANT CEUX-CI