Iron Complex Catalyzed Selective C–H Bond Oxidation with Broad Substrate Scope

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• 作者：Sandipan Jana ; Munmun Ghosh ; Mayur Ambule ; Sayam Sen Gupta
• 刊名：Organic Letters
• 出版年：2017
• 出版时间：February 17, 2017
• 年：2017
• 卷：19
• 期：4
• 页码：746-749
• 全文大小：343K
• ISSN：1523-7052

文摘

The use of a peroxidase-mimicking Fe complex has been reported on the basis of the biuret-modified TAML macrocyclic ligand framework (Fe–bTAML) as a catalyst to perform selective oxidation of unactivated 3° C–H bonds and activated 2° C–H bonds with low catalyst loading (1 mol %) and high product yield (excellent mass balance) under near-neutral conditions and broad substrate scope (18 substrates which includes arenes, heteroaromatics, and polar functional groups). Aliphatic C–H oxidation of 3° and 2° sites of complex substrates was achieved with predictable selectivity using steric, electronic, and stereoelectronic rules that govern site selectivity, which included oxidation of (+)-artemisinin to (+)-10β-hydroxyartemisinin. Mechanistic studies indicate Fe^V(O) to be the active oxidant during these reactions.