Some 1-, and 3-substituted 3-(4'-aminophenyl)pyrrolidine-2,5-diones as selective inhibitors of aromatase

Selective and tunable synthesis of 3-arylsuccinimides and 3-arylmaleimides from arenediazonium tetrafluoroborates and maleimides

A highly efficient and tunable synthetic strategy for 3-arylsuccinimides or 3-arylmaleimides has been developed from arenediazonium tetrafluoroborates and maleimides with satisfactory yields in the presence of TiCl₃ or CuCl.

Synthesis and biological evaluation of 3-(prop-2-enyl)- and 3-(prop-2-ynyl)pyrrolidine-2,5-dione derivatives as potential aromatase inhibitors

3-(4'-Aminophenyl)pyrrolidine-2,5-dione (WSP3), a known reversible inhibitor of P450 aromatase, was modified using molecular graphics and our model of reversible inhibitor and substrate binding to resemble 10 beta-prop-2-ynylestr-4-ene-3,17-dione (PED), a mechanism-based inactivator of the enzyme. The analogues prepared were 3-substituted 3-(prop-2-enyl) or 3-(prop-2-ynyl) pyrrolidine-2,5-diones and their N-alkyl derivatives. The reported compounds demonstrated no irreversible (time-dependent) inhibition of the human placental P450 aromatase enzyme. However, some reversible activity was seen in several of the 3-(prop-2-ynyl) compounds.

Racemisation of drug enantiomers by benzylic proton abstraction at physiological pH

The enantiomers of the aromatase inhibitors 3-(4-aminophenyl)-pyrrolidine-2,5-dione (WSP-3, II), its N-pentyl derivative (III), and the antifungal econazole (IV), all possessing a benzylic proton at the chiral centre, are rapidly racemised in vitro in phosphate buffer (0.01 M) at pH 7.4 and 23 degrees C with t 1/2 values of 7, 6, and 5 h respectively. In vivo studies in rats show that (+)-econazole is racemised after intraperitoneal injection with t 1/2 = 1.24h. The enantiomers of the antifungal 1-[(benzofuran-2-yl)-4-chlorophenylmethyl] imidazole (V) were stable at pH 7.4, attributable to steric hindrance to carbanion formation in the racemisation step.