A visible-light-induced direct C–H alkylation of imidazo[1,2-a]pyridines has been developed. It proceeds at room temperature by employing inexpensive Eosin Y as a photocatalyst and alkyl N-hydroxyphthalimide (NHP) esters as alkylationreagents. A variety of NHP esters derived from aliphatic carboxylicacids (primary, secondary, and tertiary) were tolerated in this protocol, giving the corresponding
Decarboxylative 1,4-carbocyanation of 1,3-enynes to access tetra-substituted allenes <i>via</i> copper/photoredox dual catalysis
作者:Ya Chen、Junjie Wang、Yixin Lu
DOI:10.1039/d1sc02896k
日期:——
An efficient synthesis of multi-substituted allenes by metallaphotoredox-catalyzed decarboxylative 1,4-carbocyanation of 1,3-enynes is described.
一种高效的方法通过金属光还原催化的脱羧1,4-碳氰化反应合成多取代联烯。
Organocatalyzed, Visible-Light Photoredox-Mediated, One-Pot Minisci Reaction Using Carboxylic Acids via <i>N</i>-(Acyloxy)phthalimides
作者:Trevor C. Sherwood、Ning Li、Aliza N. Yazdani、T. G. Murali Dhar
DOI:10.1021/acs.joc.8b00205
日期:2018.3.2
one-pot Minisci reaction has been developed using visible light, an organic photocatalyst, and carboxylic acids as radical precursors via the intermediacy of in situ-generated N-(acyloxy)phthalimides. The conditions employed are mild, demonstrate a high degree of functional group tolerance, and do not require a large excess of the carboxylic acid reactant. As a result, this reaction can be applied to
Minisci‐Type Alkylation of
<i>N</i>
‐Heteroarenes by
<i>N</i>
‐(Acyloxy)phthalimide Esters Mediated by a Hantzsch Ester And Blue LED Light
作者:Jiacheng Li、Suan Siang Tan、Sara Helen Kyne、Philip Wai Hong Chan
DOI:10.1002/adsc.202101195
日期:2022.2.15
A synthetic method that enables the Hantzsch ester-mediated Minisci-type C2-alkylation of quinolines, isoquinolines and pyridines by N-(acyloxy)phthalimide esters (NHPI) under blue LED (light emitting diode) light (456 nm) is described. Achieved under mild reaction conditions at room temperature, the metal-free synthetic protocol was shown to be applicable to primary, secondary and tertiary NHPIs to
heterocyclic N‐oxides with N‐hydroxyphthalimide esters was developed using Eosin Y as the photocatalyst in the presence of Cs2CO3 under redox‐neutral and mild conditions. Using N‐hydroxyphthalimide esters as the radicalprecursors, quinoline and pyridine N‐oxides were readily coupled with a wide range of primary, secondary, and tertiary radicals to afford the desired alkylated heterocyclic N‐oxides in moderated
使用曙红Y作为光催化剂,在Cs 2 CO 3存在下,开发了可见光诱导的杂环N-氧化物与N-羟基邻苯二甲酰亚胺酯的CH选择性烷基化烷基化反应在氧化还原中性和温和条件下。使用N-羟基邻苯二甲酰亚胺酯作为自由基前体,喹啉和吡啶N-氧化物易于与各种伯,仲和叔基团偶联,以中等至极好的收率提供所需的烷基化杂环N-氧化物。重要的是,该反应方案还成功证明了其在糖基或生物活性天然脱氢松香酸含杂环N-氧化物以及药物和农用化学活性烷基化奎宁基功能分子(潜在的抗疟药)的构建中的应用。