Selective<i>Ortho</i>-Hydroxylation-Defluorination of 2-Fluorophenolates with a Bis(μ-oxo)dicopper(III) Species
作者:Joan Serrano-Plana、Isaac Garcia-Bosch、Ryosuke Miyake、Miquel Costas、Anna Company
DOI:10.1002/anie.201405060
日期:2014.9.1
The bis(μ‐oxo)dicopper(III) species [CuIII2(μ‐O)2(m‐XYLMeAN)]2+ (1) promotes the electrophilic ortho‐hydroxylation–defluorination of 2‐fluorophenolates to give the corresponding catechols, a reaction that is not accomplishable with a (η2:η2‐O2)dicopper(II) complex. Isotopic labeling studies show that the incoming oxygen atom originates from the bis(μ‐oxo) unit. Ortho‐hydroxylation–defluorination occurs
双(μ-氧代)双铜(III)物种[Cu III 2(μ-O)2(m-XYL MeAN)] 2+(1)促进2-氟酚盐的亲电子邻羟基化-脱氟,得到相应的儿茶酚,反应不是accomplishable用(η 2:η 2 -O 2)亚铜(II)络合物。同位素标记研究表明,进入的氧原子源自bis(μ-oxo)单元。在分子内竞争中,与其他邻位取代基(例如氯或溴)选择性发生邻羟基化-脱氟。
Substituted (2-phenoxyphenyl)acetic acids with antiinflammatory activity. 1
作者:David C. Atkinson、Keith E. Godfrey、Bernard Meek、John F. Saville、Michael R. Stillings
DOI:10.1021/jm00364a004
日期:1983.10
The synthesis and antiinflammatoryactivity of a series of substituted (2-phenoxyphenyl)acetic acids are described. Initial screening in the adjuvant arthritis test showed that halogen substitution in the phenoxy ring enhanced activity considerably. Ulcerogenic potential, as measured by the minimum ulcerogenic dose (MUD), was low in almost all the acids tested. [2-(2,4-Dichlorophenoxy)phenyl]acetic
N-heterocyclic carbene-catalyzed intramolecular aza-Michael addition of alkyl amines to α,β-unsaturated carboxylic acid: Synthesis of pyrrolidines and piperidines
作者:Zhao-Fei Zhang、Zhong-Hua Gao、Chun-Lin Zhang、Song Ye
DOI:10.1016/j.tet.2021.132337
日期:2021.8
carbene-catalyzed intramolecular aza-Michael addition of alkyl amines to α,β-unsaturatedcarboxylicacid has been realized. The corresponding pyrrolidine and piperidine derivatives can be obtained in good to excellent yields. Reaction using chiral NHC catalyst showed promising enantioselectivities up to 55% ee. Further chemical transformations of the products provided carboxylicacids, alcohols, and unprotected
N-杂环卡宾催化烷基胺与α,β-不饱和羧酸的分子内氮杂-迈克尔加成反应已经实现。相应的吡咯烷和哌啶衍生物可以以良好到极好的收率获得。使用手性 NHC 催化剂的反应显示出高达 55% ee 的对映选择性。产物的进一步化学转化提供了羧酸、醇和未保护的胺。
Solution and Structural Characterization of Iron(II) Complexes with <i>Ortho</i>-Halogenated Phenolates: Insights Into Potential Substrate Binding Modes in Hydroquinone Dioxygenases
作者:Sara S. Rocks、William W. Brennessel、Timothy E. Machonkin、Patrick L. Holland
DOI:10.1021/ic101377u
日期:2010.12.6
(TACH-o-tolyl) forms a 1:1 complex with iron(II). Addition of substituted phenolates forms 1:1:1 ligand:iron:phenolatecomplexes, which have been characterized both in the solid state and in solution. There is complete binding of the phenolate to the complex only when there are ortho-halogens on the phenolate. The tertiary complexes with ortho-halo-substituted phenolates exhibit short Fe−halogen distances
Displacement of an aromatic nitro group using phenoxides
作者:P. G. Sammes、D. Thetford、M. Voyle
DOI:10.1039/c39870001373
日期:——
1,4-Dinitrobenzene undergoes nucleophilic substitution with sodium phenoxide and several hindered 2,6-substituted phenoxides to afford diphenyl ethers.