New indenyl phosphinooxazoline complexes of iron and their catalytic activity in the Mukaiyama aldol reaction
作者:Matthew Lenze、Sergey L. Sedinkin、Nigam P. Rath、Eike B. Bauer
DOI:10.1016/j.tetlet.2010.03.090
日期:2010.5
catalysts in the Mukaiyama aldol reaction. Reaction of three different PHOX ligands with [Fe(η5-Ind)I(CO)2] afforded the iodide salts of three complexes of the general formula [Fe(η5-Ind)(CO)(PHOX)]+ in 73–81% isolated yields. The molecularstructure of one of the new complexes was determined, revealing a pseudo octahedral coordinationgeometry about the iron center. The iron complexes are catalytically
Ruthenium complexes of the general formula [RuCl2(PHOX)2] and their catalytic activity in the Mukaiyama aldol reaction
作者:Nichole Curvey、Andria K. Widaman、Nigam P. Rath、Eike B. Bauer
DOI:10.1016/j.tetlet.2014.03.111
日期:2014.5
New ruthenium phosphinooxazoline (PHOX) complexes were synthesized and applied in the Mukaiyama aldol reaction. Four ruthenium complexes of the general formula [RuCl2(PHOX)(2)] were synthesized from [RuCl2(dmso)(4)] and the corresponding PHOX ligands through thermal ligand exchange. Two of the complexes were characterized structurally. Achiral PHOX ligands gave the ruthenium complexes as single isomers, whereas chiral PHOX ligands gave a mixture of isomers and also some incomplete substitution. After activation by chloride abstraction, one of the new ruthenium complexes was applied as catalyst in the Mukaiyama aldol reaction to give silyl-protected 13-hydroxyl alcohols in 74-92% isolated yields (room temperature, 18-24 h reaction time, 1 mol % catalyst loading). (C) 2014 Elsevier Ltd. All rights reserved.
New Bis(imino)pyridine Complexes of Iron(II) and Iron(III), and Their Catalytic Activity in the Mukaiyama Aldol Reaction
作者:Eike Bauer、Pushkar Shejwalkar、Nigam Rath
DOI:10.1055/s-0033-1340081
日期:——
ratios of the products was investigated. New iron(II) and iron(III) complexes bearing bis(imino)pyridine ligands were synthesized and successfully applied to the Mukaiyama aldol reaction. The two complexes [FeCl2 L] (L = bis(imino)pyridine ligand, 55% isolated yield) and [LFe(μCl)3FeCl3] (76%) were obtained employing FeCl2 and FeCl3 iron sources, respectively, and characterized by elemental analyses, mass