Development of Dihydrodibenzooxepine Peroxisome Proliferator-Activated Receptor (PPAR) Gamma Ligands of a Novel Binding Mode as Anticancer Agents: Effective Mimicry of Chiral Structures by Olefinic <i>E</i>/<i>Z</i>-Isomers
conformational restriction by the methyl group at the chiral center. On the basis of this analysis, scaffold hopping of dibenzoazepine into dibenzo[b,e]oxepine by replacing the chiral structures with the corresponding olefinic E/Z isomers was performed. Consequently, dibenzo[b,e]oxepine scaffold 9 was developed showing extremely potent PPARγ reporter activity (EC50 = 2.4 nM, efficacy = 9.5%) as well as diff