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Received 11-07-2017 Accepted 01-28-2018 Published on line 02-21-2018 Abstract Numerous diversity-oriented synthesis of N-fused cyclic heterocycles have been demonstrated but most of them are based on point diversity within the same library and usually include slow sequential multistep synthesis, which also hurt from low yields and/or poor originator scopes. In current context, an efficient synthesis has been developed with the use of potassium carbonate as base under catalytically free reaction conditions.

An efficient protocol for the synthesis of N-fused 2, 5-diketopiperazine via base catalyzed Ugi-type MCR