14β-(Isoxazol-3-yl)methylestrane Steroids: Chemoselective Synthesis and Transformations with Heterocyclic Ring Opening

Resumo

Steroids containing an isoxazole, isoxazoline, or enaminocarbonyl substituent at C-14 and a C-14-C-15-fused pyrrolidine ring were synthesized. The influence of solvents on the result of dipolar cycloaddition and solvolysis of bridged nitrosteroids was evaluated. Cytotoxicity testing of estrone analogs on cancer cells of various origins revealed activity against breast, colorectal, prostate, and lung cancer cells.