这项工作描述了一种新的结构明确、空气稳定、不含磷的钯( II )[Pd( L )Cl]( 1 )催化剂。该催化剂用于胺的N-烷基化和吲哚合成,其中发现 H 2 O 是副产物。使用这种催化剂负载量为 0.1 mol% 的均相催化剂对多种芳香胺进行烷基化。使用更环保的芳香族和脂肪族伯醇,并研究了通过金属-配体合作方法的氢自动转移策略。含抗组胺药分子三苯胺的前体以克级合成,以实现当前合成方法的大规模应用。进行了许多对照实验来研究可能的反应途径,这些实验的结果表明偶氮发色团在催化循环期间作为氢储存库。
Synthesis of Fused Indoline‐Cyclobutanone Derivatives via an Intramolecular [2+2] Cycloaddition
作者:Rifahath M. Neyyappadath、Mark D. Greenhalgh、David B. Cordes、Alexandra M. Z. Slawin、Andrew D. Smith
DOI:10.1002/ejoc.201900326
日期:2019.9
We thank the EPSRC Centre for Doctoral Training in Critical Resource Catalysis (CRITICAT, grant code EP/L016419/1, R.M.N.) for funding. We thank the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007–2013) ERC grant agreement no. 279850 (A.D.S.). A.D.S. thanks the Royal Society for a Wolfson Research Merit Award. We also thank the EPSRC UK National Mass Spectrometry
Method for the synthesis of 2-hydroxyalkyl-para-phenylenediamines, new 2-hydroxyalkyl-para-phenylenediamines, their use for oxidation dyeing, dyeing compositions and methods of dyeing
申请人:L'Oreal S.A.
公开号:US06306179B1
公开(公告)日:2001-10-23
The present invention relates to a new method for the synthesis of 2-hydroxyalkyl-para-phenylenediamines which are substituted or unsubstituted at the 5-position of the benzene ring, new 2-hydroxyalkyl-para-phenylenediamines which are substituted or unsubstituted at the 5-position of the benzene ring, their use for the oxidation dyeing of keratinous fibers, the dyeing compositions containing them, as well as the methods of dyeing using them.
Diaryliodonium Salt-Based Synthesis of <i>N</i>-Alkoxyindolines and Further Insights into the Ishikawa Indole Synthesis
作者:Kouhei Shibata、Ken-ichi Takao、Akihiro Ogura
DOI:10.1021/acs.joc.1c00820
日期:2021.8.6
involves reductive elimination of iodobenzene from iodaoxazepine via a four-membered transition state, followed by Meisenheimer rearrangement. Substrates with N-carbamate protection afforded indole in a manner similar to that of the Ishikawa indole synthesis. Preinstallation of a stannyl group as an iodonium salt precursor greatly expanded the substrate scope, and further mechanistic insights are discussed
Oxidative Cyclization of Amino Alcohols Catalyzed by a Cp*Ir Complex. Synthesis of Indoles, 1,2,3,4-Tetrahydroquinolines, and 2,3,4,5-Tetrahydro-1-benzazepine
oxidative cyclization of amino alcohols has been revealed. Indole derivatives are synthesized in good to excellent yields from2-aminophenethylalcohols by means of a [CpIrCl(2)](2)/K(2)CO(3) catalytic system. The present catalytic system is also effective for syntheses of 1,2,3,4-tetrahydroquinolines from 3-(2-aminophenyl)propanols and 2,3,4,5-tetrahydro-1-benzazepine from 4-(2-aminophenyl)butanol.
Nickel-Catalyzed Direct Synthesis of <i>N</i>-Substituted Indoles from Amino Alcohols and Alcohols
作者:Vinita Yadav、Sayali G. Jagtap、Ekambaram Balaraman、Santosh B. Mhaske
DOI:10.1021/acs.orglett.2c03617
日期:2022.12.16
primary alcohols, cyclic and acyclic secondary alcohols, and various substituted 2-aminophenyl ethyl alcohols are employed in the reactionconditions to provide a diverse range of N-alkylated indoles. Mechanistic studies revealed that the reaction proceeds through tandem N-alkylation via hydrogen autotransfer followed by the cyclization of N-alkylated alcohol intermediate.