Air Stable Iron(II) PNP Pincer Complexes as Efficient Catalysts for the Selective Alkylation of Amines with Alcohols

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• 作者：Matthias Mastalir ; Berthold Stö ; ger ; Ernst Pittenauer ; Michael Puchberger ; Gü ; nter Allmaier and Karl Kirchner
• 刊名：Advanced Synthesis & Catalysis
• 出版年：2016
• 出版时间：December 7, 2016
• 年：2016
• 卷：358
• 期：23
• 页码：3824-3831
• 全文大小：794K
• ISSN：1615-4169

文摘

A series of well-defined iron(II) complexes of the types [Fe(PNP)Br₂] and [Fe(PNP)(CO)Br₂] with PNP pincer ligands based on triazine and pyridine backbones were prepared and fully characterized. These complexes were tested as catalysts for the alkylation of amines by alcohols. The high-spin complexes [Fe(PNP)Br₂] are catalytically inactive. The low-spin complexes [Fe(PNP)(CO)Br₂] bearing a carbonyl co-ligand efficiently and selectively convert primary alcohols and aromatic and benzylic amines selectively into mono-N-alkylated amines in good to excellent isolated yields. A mechanistic proposal is given.