ortho-Metalation of Unprotected 3-Bromo and 3-Chlorobenzoic Acids with Hindered Lithium Dialkylamides
摘要:
Upon treatment of 3-chloro/bromobenzoic acids with hindered lithium dialkylamides (LDA or LTMP) at -50 degreesC, lithium 3-chloroibromo-2-lithiobenzoates are generated. These dianions can be trapped as such to afford after electrophilic quenching a variety of simple 2-substituted-3-chlorolbromobenzoic acids. The 3-bromo-2-lithiobenzoate is less stable than the corresponding 3-chloro derivative and partly eliminates lithium bromide, thus setting free lithium 2,3- and 3,4-dehydrobenzoates that can be intercepted in situ with the hindered base.
Pharmaceutical compositions and methods of inhibiting phenylethanolamine
申请人:SmithKline Corporation
公开号:US03988339A1
公开(公告)日:1976-10-26
Pharmaceutical compositions and methods of inhibiting phenylethanolamine N-methyltransferase using 7 and/or 8 substituted 1,2,3,4-tetrahydroisoquinoline compounds.
制药组合物和使用7和/或8取代的1,2,3,4-四氢异喹啉化合物抑制苯乙醇胺N-甲基转移酶的方法。
Ir
<sup>III</sup>
‐Catalyzed Selective
<i>ortho</i>
‐Monoiodination of Benzoic Acids with Unbiased C−H Bonds
作者:Erik Weis、Magnus J. Johansson、Belén Martín‐Matute
DOI:10.1002/chem.202002204
日期:2020.8.12
An iridium‐catalyzed selective ortho‐monoiodination of benzoicacids with two equivalent C−H bonds is presented. A wide range of electron‐rich and electron‐poor substrates undergo the reaction under mild conditions, with >20:1 mono/di selectivity. Importantly, the C−H iodination occurs selectively ortho to the carboxylic acid moiety in substrates bearing competing coordinating directing groups. The
One-Pot Synthesis and Conformational Analysis of Six-Membered Cyclic Iodonium Salts
作者:Lucien D. Caspers、Julian Spils、Mattis Damrath、Enno Lork、Boris J. Nachtsheim
DOI:10.1021/acs.joc.0c01125
日期:2020.7.17
diphenylmethane scaffolds, which are subsequently oxidized and cyclized to the corresponding dibenzo[b,e]iodininium salts. Based on NMR investigations and density functional theory (DFT) calculations, we could verify the so-far-undescribed existence of two stable isomers in cyclic iodoniumsalts substituted with aliphatic side chains in the carbon bridge.
practical method for the preparation of nonexplosive cyclic hypervalentiodine(III) oxidants as efficient organocatalysts and reagents for various reactions using Oxone® in aqueous solution under mild conditions at room temperature. The thus obtained 2-iodosobenzoic acids (IBAs) could be used as precursors of other cyclic organoiodine(III) derivatives by the solvolytic derivatization of the hydroxy
[EN] EphA4 INHIBITORS AS NEUROPROTECTIVE AGENTS<br/>[FR] INHIBITEURS D'EPHA4 EN TANT QU'AGENTS NEUROPROTECTEURS
申请人:UNIV HONG KONG SCIENCE & TECHN
公开号:WO2015007222A1
公开(公告)日:2015-01-22
Provided is the discovery of the role of EphA4 signaling in neurodegenerative disorders involving β-amyloid induced neurotoxicity such as Alzheimer's Disease. New therapeutic methods, therapeutic agents, and kits for treating diseases caused or exacerbated by overactivated EphA4 signaling are provided. Also provided are methods for identifying additional compounds as therapeutic agents useful for treating conditions involving overly active EphA4 signaling.