据报道,使用各种伯,仲和叔烷基三氟硼酸酯进行光氧化还原催化的杂芳烃的CH官能化。描述了使用Fukuzumi的有机光催化剂和温和的氧化剂,适合于功能化复杂杂芳族化合物的条件,为后期衍生化提供了有价值的工具。报告的方法解决了先前报道的光氧化还原介导的Minisci反应的三个主要局限性:(1)使用超化学计量的自由基前体,(2)反复选择性,以及(3)引入昂贵的光催化剂。另外,使用了许多前所未有的复杂烷基,从而增加了Minisci化学可利用的化学空间。为了展示后期功能化中的应用程序,合成了奎宁和喜树碱类似物。最后,进行了NMR研究以提供合理的杂芳基活化作用,该活化作用允许使用单当量的自由基前体,并且还提高了区域选择性。因此,在酸催化剂和BF 3的存在下观察到1 H和13 C NMR观察到独特的杂芳基物质。
Enabling Metallophotoredox Catalysis in Parallel Solution-Phase Synthesis Using Disintegrating Reagent Tablets
作者:Niginia Borlinghaus、Barbara Schönfeld、Stephanie Heitz、Johanna Klee、Stella Vukelić、Wilfried M. Braje、Anais Jolit
DOI:10.1021/acs.joc.1c01867
日期:2021.12.3
user-friendly chemical delivery system for two different metallophotoredox-catalyzed reactions. This delivery method simplifies the preparation of compound libraries using photoredox chemistry in a parallel setting. The reagent tablets were successfully applied to late-stage functionalization of drug-like intermediates. These tablets can be prepared with various reagents and catalysts in different sizes
Modular synthesis of α-arylated carboxylic acids, esters and amides <i>via</i> photocatalyzed triple C–F bond cleavage of methyltrifluorides
作者:Sifan Li、Paul W. Davies、Wei Shu
DOI:10.1039/d2sc01905a
日期:——
operationally simple strategy features a unified access to functionally diverse α-arylated carboxylic acids, esters, and primary, secondary, and tertiary amides through backbone assembly from simple starting materials enabled by consecutive C–F bond functionalization at roomtemperature. Preliminary mechanistic investigations reveal that the reaction operates through a radical-triggered three-step cascade
Metal-free C–H alkylation of heteroarenes with alkyltrifluoroborates: a general protocol for 1°, 2° and 3° alkylation
作者:Jennifer K. Matsui、David N. Primer、Gary A. Molander
DOI:10.1039/c7sc00283a
日期:——
A photoredox-catalyzed C–H functionalization of heteroarenes using a variety of primary, secondary, and tertiary alkyltrifluoroborates is reported. Using Fukuzumi's organophotocatalyst and a mild oxidant, conditions amenable for functionalizing complex heteroaromatics are described, providing a valuable tool for late-stage derivatization. The reported method addresses the three major limitations of
据报道,使用各种伯,仲和叔烷基三氟硼酸酯进行光氧化还原催化的杂芳烃的CH官能化。描述了使用Fukuzumi的有机光催化剂和温和的氧化剂,适合于功能化复杂杂芳族化合物的条件,为后期衍生化提供了有价值的工具。报告的方法解决了先前报道的光氧化还原介导的Minisci反应的三个主要局限性:(1)使用超化学计量的自由基前体,(2)反复选择性,以及(3)引入昂贵的光催化剂。另外,使用了许多前所未有的复杂烷基,从而增加了Minisci化学可利用的化学空间。为了展示后期功能化中的应用程序,合成了奎宁和喜树碱类似物。最后,进行了NMR研究以提供合理的杂芳基活化作用,该活化作用允许使用单当量的自由基前体,并且还提高了区域选择性。因此,在酸催化剂和BF 3的存在下观察到1 H和13 C NMR观察到独特的杂芳基物质。
Decarboxylative Borylation of Aliphatic Esters under Visible-Light Photoredox Conditions
作者:Dawei Hu、Linghua Wang、Pengfei Li
DOI:10.1021/acs.orglett.7b01181
日期:2017.5.19
methods for preparing alkyl boronates often necessitate anhydrous and demanding reaction conditions. Herein, a new, operationally simple decarboxylative borylation reaction of readily available aliphaticacid derivatives under additive-free visible-light photoredox conditions in nonanhydrous solvents has been described. Primary and secondary alkyl boronates or tetrafluoroborates with various functional