A new series of 3, 3-disubstituted-5-aryloxindoles has been synthesized and evaluated for progesterone receptor antagonist (PR) activity in a T47D cell alkaline phosphatase assay and for their ability to bind PR in competition binding studies. In this communication, the synthesis and structure–activity relationships (SARs) of various 3, 3-substituents are discussed where it is clear that small alkyl and spiroalkyl groups are required to achieve ...