Convergent solution-phase combinatorial synthesis with multiplication of diversity through rigid biaryl and diarylacetylene couplings

The solution-phase synthesis of iminodiacetic acid diamide libraries Linked to aryl iodides and their Pd-catalyzed dimerization are detailed. Mixtures containing 64 980 components are synthesized in only 4 steps from N-BOC-iminodiacetic acid anhydride (1) and 21 readily available starting materials, demonstrating the multiplication of diversity achievable by the convergent assembly of building blocks. Both biaryl formation and sequential Stille couplings with bis(tributylstannyl)acetylene are utilized to dimerize the functionalized iminodiacetic acid diamide precursors resulting in product libraries with two sets of binding groups separated by variable length rigid linkers suitable for probing protein-protein interactions. Deconvolution libraries synthesized alongside the full mixtures allow for identification of active components.