Substrate scope in the copper-mediated construction of bis-oxindoles via a double C–H/Ar–H coupling process
摘要:
The synthesis of bis-oxindoles via the copper(II)-mediated double cyclisation of linear bis-anilides is described. Cu(OAc)(2)center dot H2O was identified as an efficient and inexpensive catalyst for this process. In contrast to previous methods, which rely on the synthesis of the central core from existing oxindole building blocks, this new approach focusses on concurrent formation of both oxindole rings from a simple linear precursor, allowing the formation of bis-oxindoles containing a diverse range of cyclic and acyclic linkers using a single synthetic method. (C) 2015 Elsevier Ltd. All rights reserved.
Syntheses and Structure−Activity Relationships of 5,6,7,8-Tetrahydro-5,5,8,8-tetramethyl-2-quinoxaline Derivatives with Retinoic Acid Receptor α Agonistic Activity
studies on retinoic acid receptor (RAR) agonists, we have designed and synthesized a series of quinoxaline derivatives. One of them, 4-[5-(5,6,7,8-tetrahydro-5,5,8, 8-tetramethyl-2-quinoxalinyl)-1H-2-pyrrolyl]benzoic acid (3a), which possesses a 2,5-disubstituted pyrrole moiety, showed selectivity for the RARalpha receptor and exerted highly potent cell-differentiating activity on HL-60 cells.
Interaction of 6,6′′-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-1,2,4-benzotriazin-3-yl)-2,2′:6′,2′′-terpyridine (CyMe4-BTTP) with some trivalent ions such as lanthanide(iii) ions and americium(iii)
作者:Frank W. Lewis、Laurence M. Harwood、Michael J. Hudson、Michael G. B. Drew、Giuseppe Modolo、Michal Sypula、Jean F. Desreux、Nouri Bouslimani、Geoffrey Vidick
DOI:10.1039/b924988e
日期:——
2′′-terpyridine. Detailed NMR and mass spectrometry studies indicate that the ligand forms 1 : 2 complexes with lanthanide(III) perchlorates where the aliphatic rings are conformationally constrained whereas 1 : 1 complexes are formed with lanthanide(III) nitrates where the rings are conformationally mobile. An optimized structure of the 1 : 2 solution complex with Yb(III) was obtained from the relative
[EN] SYNTHESIS OF LIGANDS FOR USE IN ACTINIDE EXTRACTION<br/>[FR] SYNTHÈSE DE LIGANDS UTILISABLES POUR L'EXTRACTION D'ACTINIDES
申请人:UNIV READING
公开号:WO2011077081A1
公开(公告)日:2011-06-30
The invention discloses an improved process for the preparation of 2,2,5,5-tetrasubstituted hexane-1,6-dicarbonyl compounds, and in particular diethyl 2,2,5,5-tetramethylhexanedioate and dimethyl 2,2,5,5-tetramethylhexanedioate, by the alkylation of 1,2-difunctional ethane compounds with enolates of carbonyl compounds. The process provides higher yields and greater synthetic brevity than existing processes.
[EN] BRANCHED ADIPIC ACID BASED ESTERS AS NOVEL BASE STOCKS AND LUBRICANTS<br/>[FR] ESTERS À BASE D'ACIDE ADIPIQUE RAMIFIÉ UTILISÉS EN TANT QUE NOUVELLES HUILES DE BASE ET LUBRIFIANTS
申请人:BASF SE
公开号:WO2019110355A1
公开(公告)日:2019-06-13
The presently claimed invention is directed to the use of branched adipic acid esters as lubricants as well as lubricant compositions containing the branched adipic acid esters.
stability constants of various ligands with Eu(lll) were obtained by fitting titration curve. Additionally, the basicity of various ligands was determined to be 3.1 ± 0.1, 2.3 ± 0.2, 0.9 ± 0.2, 0.5 ± 0.1 by NMR in the media of CD3OD with the addition of DClO4. The basicity of ligands follows the order of L1 > L2 > L3 > L4, indicating the tendency of protonation decreases with the electron-withdrawing