Iron Catalyzed Highly Enantioselective Epoxidation of Cyclic Aliphatic Enones with Aqueous H<sub>2</sub>O<sub>2</sub>
作者:Olaf Cussó、Marco Cianfanelli、Xavi Ribas、Robertus J. M. Klein Gebbink、Miquel Costas
DOI:10.1021/jacs.5b12681
日期:2016.3.2
An iron complex with a C1-symmetric tetradentate N-based ligand catalyzes the asymmetric epoxidation of cyclic enones and cyclohexene ketones with aqueous hydrogen peroxide, providing the corresponding epoxides in good to excellent yields and enantioselectivities (up to 99% yield, and 95% ee), under mild conditions and in short reaction times. Evidence is provided that reactions involve an electrophilic
具有 C1 对称四齿 N 基配体的铁配合物催化环烯酮和环己烯酮与过氧化氢水溶液的不对称环氧化反应,提供相应的环氧化物,产率和对映选择性都很好(高达 99% 和 95% ee ),条件温和,反应时间短。有证据表明反应涉及亲电氧化剂,并且该元素用于对包含两个烯烃位点的烯酮进行位点选择性环氧化。
Catalytic Asymmetric Epoxidation of Cyclic Enones
作者:Xingwang Wang、Corinna M. Reisinger、Benjamin List
DOI:10.1021/ja801181u
日期:2008.5.1
A highly enantioselective epoxidation of cyclicenones with hydrogen peroxide has been developed that is catalyzed by chiral primaryamine salts.
已经开发了由手性伯胺盐催化的环烯酮与过氧化氢的高度对映选择性环氧化。
Highly enantioselective epoxidation of olefins by H<sub>2</sub>O<sub>2</sub> catalyzed by a non-heme Fe(<scp>ii</scp>) catalyst of a chiral tetradentate ligand
作者:Mainak Mitra、Olaf Cusso、Satish S. Bhat、Mingzhe Sun、Marco Cianfanelli、Miquel Costas、Ebbe Nordlander
DOI:10.1039/c8dt04449j
日期:——
ability of the iron complex to catalyze asymmetric epoxidation reactions of olefins with H2O2 was investigated, using 2-cyclohexen-1-one, 2-cyclopenten-1-one, cis-β-methylstyrene, isophorone, chalcones and tetralones as substrates. Different carboxylic acids were used as additives to enhance yields and enantioselectivities, and 2-ethylhexanoic acid was found to give the best results. The catalysis results
手性四齿N4-供体配体1-甲基-2-((S)-2-[(S)-1-(1-甲基苯并咪唑-2-基甲基)吡咯烷-2-基]吡咯烷-1-基}基于手性二吡咯烷骨架的}甲基)苯并咪唑(S,S - PDBz L)已合成,并已制备并表征了其相应的Fe(II)配合物。配合物的X射线结构表明,Fe(II)离子处于扭曲的八面体配位环境中,两个顺式取向配位点被(不稳定的)三氟甲磺酸根阴离子占据。铁络合物催化烯烃与H 2 O 2的不对称环氧化反应的能力以2-环己烯-1-酮,2-环戊烯-1-酮,顺式-β-甲基苯乙烯,异佛尔酮,查耳酮和四氢萘酮为底物进行了研究。使用不同的羧酸作为添加剂来提高收率和对映选择性,发现2-乙基己酸的效果最佳。催化结果表明,Fe(II)配合物能够在环氧化反应中实现相对较高的对映选择性(> 80%)。
On the stereochemistry of the BF3-catalyzed rearrangement of (+)-isophorone oxide