A novel series of achiral TNF-α converting enzyme (TACE) inhibitors has been discovered. These compounds exhibited activities from 0.35 to 11nM in a porcine TACE assay and inhibited TNF-α production in an LPS-stimulated whole blood assay with an IC50 value of 23nM for the most potent one. They also have excellent selectivities over related metalloproteases including aggrecanases.