Abstract
A series of acyl derivatives of 3-amino-1-phenyl-4,5-dihydro-1 H-pyrazol-5-one as potential human 5-LOX and COX 1 and COX-2 inhibitors structurally related to the 1-phenyl-3-pyrazolidinone (phenidone, 1) have been synthesized and the activity against COX-1, COX-2 and human 5-LOX enzymes has been evaluated. All the derivatives showed poor activity against enzymes. These data, together with our previous studies, indicated that phenidone and related compounds are not suitable as human 5-LOX inhibitors and that pyrazoline nucleus should not be considered a good scaffold for inhibitors of human 5-LOX enzyme, suggesting the necessity to revisit the proposed mechanism of action of phenidone ( 1) in human models.
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