Аннотация:The present study offers a new approach for designing inhibitors of protein tyrosine phosphatases. We have synthesized the cyclam derivatives with a,a-difluoro-b-ketophosphonate fragments covalently attached to tetraazamacrocyclic scaffold, which is known to be of medical interest. The obtained functionalized macrocycles were evaluated as inhibitors of PTP1B, TC-PTP, CD45, and other protein tyrosine phosphatases.