Soluble polymer-supported synthesis of benzodiazepinones

Soluble polymer-supported synthetic method provides a highly efficient route for the construction of biologically important 1,5-benzodiazepin-2-ones. A library of N-substituted benzodiazepinones can be readily assembled utilizing SNAr reaction, reduction of nitro group and one-pot cyclization following N-alkylation as the key step in the synthesis. All reactions in the sequence were performed at room temperature to facilitate the generation of libraries in a parallel fashion. The crude products were obtained in 80–95% yield with 60–96% HPLC purity.