Olefin-Dependent Discrimination between Two Nonheme HOFe<sup>V</sup>O Tautomeric Species in Catalytic H<sub>2</sub>O<sub>2</sub>Epoxidations
作者:Anna Company、Yan Feng、Mireia Güell、Xavi Ribas、Josep M. Luis、Lawrence Que、Miquel Costas
DOI:10.1002/chem.200802597
日期:2009.3.23
water incorporation into products (up to 75 %) is observed in epoxidation reactions with H2O2 by a bioinspired nonheme iron catalyst. A surprising substrate‐dependent incorporation of water is observed, and is proposed to arise from fast equilibrium betweentwo high‐valent HOFeVO isomeric species exhibiting different reactivity.
湿式加氧酶模型:在通过生物启发的非血红素铁催化剂与H 2 O 2进行的环氧化反应中,观察到前所未有的高水平的水混入产品(高达75%)。水的令人惊讶的衬底依赖性掺入观察到的,并提出了两个高价HO之间从快速平衡出现铁V表现出不同的反应性O异构体物种。
Photocatalytic Asymmetric Epoxidation of Terminal Olefins Using Water as an Oxygen Source in the Presence of a Mononuclear Non-Heme Chiral Manganese Complex
作者:Duyi Shen、Claudio Saracini、Yong-Min Lee、Wei Sun、Shunichi Fukuzumi、Wonwoo Nam
DOI:10.1021/jacs.6b10836
日期:2016.12.14
epoxidation of terminal olefins using a mononuclear non-heme chiral manganese catalyst, [(R,R-BQCN)MnII]2+, and water as an oxygen source yields epoxides with relatively high enantioselectivities (e.g., up to 60% enantiomeric excess). A synthetic mononuclear non-heme chiral Mn(IV)-oxo complex, [(R,R-BQCN)MnIV(O)]2+, affords similar enantioselectivities in the epoxidation of terminal olefins under stoichiometric
Titanium enolates from epoxides and bis(pentamethylcyclopentadienyl)dimethyltitanium(IV)
作者:Charles P. Gibson、Gary Dabbagh、Steven H. Bertz
DOI:10.1039/c39880000603
日期:——
Typical epoxides such as cyclohexene oxide and cis- and trans-but-2-ene oxide are converted to titaniumenolates by heating at 80 °C with the title compound.
Nucleophilic ring opening of <i>trans</i>-2,3-disubstituted epoxides to β-amino alcohols with catalyst-controlled regioselectivity
作者:Michelle Lee、Jessica R. Lamb、Maria J. Sanford、Anne M. LaPointe、Geoffrey W. Coates
DOI:10.1039/c8cc07200k
日期:——
We report the nucleophilic ringopening of unsymmetrical trans-epoxides to β-amino alcohols with catalyst-controlled regioselectivity. This cationic aluminum salen catalyst, which contains bulky mesityl groups in the ortho-position of the phenoxide and a 2,2′-diamino-1,1′-binaphthalene backbone, transforms a variety of epoxides with high regioselectivity using nitrogen-containing nucleophiles. Unlike