醇是天然丰富的生物相关有机化合物中最广泛存在的官能团之一,在许多情况下被视为原料化学品。在此,我们报告了一种在可见光促进下醇衍生的苯甲酸酯和吡啶脱氧偶联的无金属方法。考虑到实用、温和且与水相容的条件,小分子和 DNA 头件可以成功地用一系列伯醇、仲醇和叔醇进行功能化。该方案的特点是其底物范围广泛和适用性广泛,即使在后期功能化和 DNA-药物偶联反应的背景下也是如此。
A novel iron-mediated direct C–H arylation of quinones and pyridine analogues with arylboronic acids has been developed using dichloromethane and water as solvents at ambient temperature. FeS is employed and serves as an efficient catalyst. A detailed reaction mechanism is speculated and expounded.
Direct Arylation of Substituted Pyridines with Arylboronic Acids Catalyzed by Iron(II) Oxalate
作者:Yibo Huang、Dan Guan、Liang Wang
DOI:10.1002/cjoc.201400528
日期:2014.12
The directarylation of substitutedpyridines with several arylboronicacids has been developed. This transformation could proceed readily at ambient temperature using inexpensive reagents: iron(II) oxalate as a catalyst, potassium persulfate as a co‐oxidant, which can afford the arylated products in mild to good yields. The mechanism is presumed to proceed through a nucleophilic radical addition to
Intermediary radical cations, generated through single-electron oxidation of enolsilylethers by excited Ir-based photocatalysts, can be exploited as Brønsted acids for the activation of heteroarylcyanides. This strategy enables the direct allylic C−H heteroarylation of enolsilylethers under visible-light irradiation.
中间自由基阳离子是通过激发的 Ir 基光催化剂通过烯醇甲硅烷基醚的单电子氧化产生的,可用作布朗斯台德酸来活化杂芳基氰化物。该策略使烯醇甲硅烷基醚在可见光照射下直接烯丙基 CH 杂芳基化成为可能。
Lewis Acid-Catalyzed Borono-Minisci Reactions of Arylboronic Acids and Heterocycles
作者:Timothy J. Barker、Joyce L. Biaco、Savannah L. Jones
DOI:10.3987/com-16-13506
日期:——
A Lewis acid-catalyzed Minisci reaction between arylboronic acids and heterocycles has been developed. This radical-coupling reaction was demonstrated employing several different heterocycles as well as electron-rich arylboronic acids. Quinoline substrates afforded modest regioselectivity for substitution at the 4-position under the reaction conditions, in contrast to previously reported Bronsted acid-mediated reactions with quinoline substrates that favored substitution at the 2-position.
[DE] VERFAHREN ZUR HERSTELLUNG VON METALLIERTEN ORGANISCHEN VERBINDUNGEN<br/>[EN] METHODS FOR PRODUCING METALATED ORGANIC COMPOUNDS<br/>[FR] PROCÉDÉS DE PRÉPARATION DE COMPOSÉS ORGANIQUES MÉTALLÉS
申请人:UNIV MUENCHEN LUDWIG MAXIMILIANS
公开号:WO2016184652A9
公开(公告)日:2017-08-10
[EN] The present invention relates to methods for producing metalated organic compounds R1-Met under continuous flow conditions. The invention further relates to the metalated compounds obtained by these methods, and to the further reaction thereof with electrophilic reagents and the compounds obtained thereby. The invention also relates to methods for producing metalated organic compounds with Lewis-acidic hydrogen R1-Met using the base Cy2NLi. [FR] La présente invention concerne des procédés de production de composés organique métallés R1-Met dans des conditions de flux continu. Elle concerne également les composés métallés ainsi obtenus, ainsi que leur mise en réaction ultérieure avec des électrophiles et les composés ainsi obtenus. Elle concerne encore des procédés de production de composés organiques métallés avec de l'hydrogène d'acide de Lewis R1-Met à l'aide de la base Cy2NLi. [DE] Die vorliegende Anmeldung offenbart Verfahren zur Herstellung metallierter organischer Verbindungen R1-Met unter kontinuierlichen Flussbedingungen. Die Anmeldung offenbart auch die dadurch erhältlichen metallierten Verbindungen, sowie deren weitere Umsetzung mit Elektrophilen und die dadurch erhältlichen Verbindungen. Daneben werden Verfahren zur Herstellung metallierter organischer Verbindungen mit Lewis-acidem Wasserstoff R1-Met unter Verwendung der Base Cy2NLi offenbart.