In the development of plasmin inhibitors, a novel chemotype, pyrrolopyrimidine scaffold possessing two motifs, a hydantoin-containing P4 moiety and a warhead-containing P1 moiety, is uncovered. A unique feature of the new line of the plasmin inhibitors is that the interaction between the plasmin inhibitors and key subsites in plasmin can be controlled by a spacer like hydantoin. The application of the novel chemotype is demonstrated by 1n and provides further evidence on the importance of hydantoin as the spacer.
Keywords: Hydantoin; P4 moiety; Plasmin inhibitors; Pyrrolopyrimidine; Scaffold; Structure–activity relationship.
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