Oxidation of Δ<sup>4</sup>- and Δ<sup>5</sup>-Steroids with Hydrogen Peroxide Catalyzed by Porphyrin Complexes of Mn<sup>III</sup>and Fe<sup>III</sup>
作者:Susana L. H. Rebelo、Mário M. Q. Simões、M. Graça P. M. S. Neves、Artur M. S. Silva、José A. S. Cavaleiro、Andreia F. Peixoto、Mariette M. Pereira、Manuela R. Silva、José A. Paixão、Ana M. Beja
DOI:10.1002/ejoc.200400461
日期:2004.12
environmentally friendly method to promote the stereoselective epoxidation of Δ4- and Δ5-steroids. Metalloporphyrins efficiently catalyze the epoxidation reactions of 17β-acetoxy-4-androstene (1), 4-cholestene (2) and 3β-acetoxy-5-cholestene (3) in the presence of H2O2 as oxygen donor. Modeling the molecular structure of the porphyrin as well as the central metal allows the control of the preferential