Abstract
A series of 3-substituted 5-hydroxy-1,2,4-triazin-6(1H)-one derivatives were designed and synthesized as a new class of d-amino acid oxidase (DAAO) inhibitors. Some of the newly synthesized derivatives showed potent inhibitory activity against human DAAO with IC50 values in the nanomolar range. Among them, 6-hydroxy-3-phenethyl-1,2,4-triazin-5(2H)-one 6b and 3-((6-fluoronaphthalen-2-yl)methylthio)-6-hydroxy-1,2,4-triazin-5(2H)-one 6m were found to be metabolically stable in mouse liver microsomes. In addition, compound 6b was found to be orally available in mice and able to enhance plasma d-serine levels following its co-administration with d-serine compared to the oral administration of d-serine alone.
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