Solid-phase synthesis of libraries generated from a 4-phenyl-2-carboxy-piperazine scaffold.

Strategies for finding novel structures of therapeutical interest are discussed. The rationale for the selection of the two scaffolds N4-(m-aminophenyl)-piperazine-2-carboxylic acid E and N4-(o-aminophenyl)-piperazine-2-carboxylic F is described. The synthesis of the appropriate precursors to scaffold E and F and their use in solid-phase chemistry are described. A 160-member library was produced combining these novel piperazine scaffolds with eight sulfonyl chlorides/acid chlorides and 10 amines. The compound library prepared was analyzed using LC-MS, showing the expected base peak in all wells at an average purity of 82%.