Regioselective, Photocatalytic α-Functionalization of Amines
摘要:
Photocatalytic alpha-functionalization of amines provides a mild and atom-economical means to synthesize alpha-branched amines. Prior examples featured symmetrical or electronically biased substrates. Here we report a controllable alpha-functionalization of amines in which regioselectivity can be tuned with minor changes to the reaction conditions.
Potassium <i>tert</i>-Butoxide Promoted Intramolecular Arylation via a Radical Pathway
作者:Daniela Sustac Roman、Yoko Takahashi、André B. Charette
DOI:10.1021/ol201160s
日期:2011.6.17
Potassium tert-butoxide mediated intramolecular cyclization of aryl ethers, amines, and amides was efficiently performed under microwave irradiation to provide the corresponding products in high regioisomeric ratios. The reaction proceeds via single-electron transfer to initiate the formation of an arylradical, followed by a kinetically favored 5-exo-trig and subsequent ring expansion.
Nickel-catalyzed cross-coupling of aryltrimethylammonium triflates and amines
作者:Xue-Qi Zhang、Zhong-Xia Wang
DOI:10.1039/c3ob41989d
日期:——
Nickel-catalyzed cross-coupling of aryltrimethylammonium triflates and amines was carried out under mild conditions. The reaction has a broad scope of substrates and can be performed by a one-pot procedure from an aryldimethylamine.
Copper-Catalyzed <i>N</i>- and <i>O</i>-Alkylation of Amines and Phenols using Alkylborane Reagents
作者:Shunsuke Sueki、Yoichiro Kuninobu
DOI:10.1021/ol400323z
日期:2013.4.5
in the presence of a catalytic amount of copper(II) acetate Cu(OAc)2 and di-tert-butyl peroxide, a cross-coupling reaction proceeded and alkylated amines were obtained in good to excellent yields. Phenols are also applicable for this reaction, and the corresponding alkyl aryl ethers were produced.
<i>peri</i>
‐Xanthenoxanthene (PXX): a Versatile Organic Photocatalyst in Organic Synthesis
作者:Cristofer Pezzetta、Andrea Folli、Oliwia Matuszewska、Damien Murphy、Robert W. M. Davidson、Davide Bonifazi
DOI:10.1002/adsc.202100030
日期:2021.10.19
to be accessible: the β-arylation of cyclic ketones is successful when using a secondary amine as organocatalyst, while cross-coupling reactions of aryl halides with amines and thiols are obtained when using a Ni co-catalyst. Application to the efficient two-step synthesis of the expensive fluoro-tetrahydro-1H-pyrido[4,3-b]indole, a crucial synthetic intermediate for the investigational drug setipiprant
近年来,光催化剂的不断发展,以满足对光氧化还原催化中光物理和氧化还原性能日益增长的需求,设计了复杂的结构或替代策略来获得高度还原或氧化系统。我们在此报告了使用peri- xanthenoxanthene (PXX),一种简单且廉价的染料,作为一种有效的光催化剂。其高度还原的激发态可激活多种底物,从而引发有用的自由基反应。最初证明了基准转换,例如通过有机卤化物的光还原产生的有机自由基添加到自由基陷阱。还显示可以使用更复杂的双催化歧管:β当使用仲胺作为有机催化剂时,环酮的芳基化是成功的,而当使用 Ni 助催化剂时,芳基卤化物与胺和硫醇的交叉偶联反应是成功的。昂贵的氟-四氢-1 H-吡啶并[4,3- b ]吲哚的高效两步合成应用也已得到证实,该吲哚是研究药物塞替吡仑的关键合成中间体。
Regiospecific N-Arylation of Aliphatic Amines under Mild and Metal-Free Reaction Conditions
A transition metal‐freeN‐arylation of primary and secondary amines with diaryliodonium salts is presented. Both acyclic and cyclic amines are well tolerated, providing a large set of N‐alkyl anilines. The methodology is unprecedented among metal‐free methods in terms of amine scope, the ability to transfer both electron‐withdrawing and electron‐donating aryl groups, and efficient use of resources