Synthesis of Biaryls and Aryl Ketones<i>via</i>Microwave-Assisted Decarboxylative Cross-Couplings
作者:Lukas J. Gooßen、Bettina Zimmermann、Christophe Linder、Nuria Rodríguez、Paul P. Lange、Jens Hartung
DOI:10.1002/adsc.200900337
日期:2009.11
A protocol for the microwave-assisted decarboxylative cross-couplings of carboxylic acid salts with aryl halides has been developed that allows the synthesis of various biaryls and aryl ketones in high yields. After careful adaptation of the bimetallic catalyst system and reaction conditions, these mechanistically complex transformations can now be performed within only five minutes in concentrated
The RuH2(CO)(PPh3)3-catalyzed C–H functionalization of aromatic esters with 5,5-dimethyl-2-aryl-[1,3,2]dioxaborinanes (arylboronates) gave the orthoarylation products. This coupling reaction can be performed with various combinations of isopropyl benzoate derivatives and arylboronates. Introduction of CF3 group in the aromatic ring increased the reactivity of the esters. Pinacolone effectively served
RuH 2(CO)(PPh 3)3催化的芳香族酯与5,5-二甲基-2-芳基-[1,3,2]二氧杂硼烷酮(芳基硼酸酯)的C–H官能化反应得到邻芳基化产物。该偶联反应可以用异丙基苯甲酸酯衍生物和芳基硼酸酯的各种组合进行。在芳环中引入CF 3基团增加了酯的反应性。Pinacolone有效地充当了由C–H键断裂产生的氢化物的接受体,并且使用的pinacolone的量也影响了芳基化产物的收率。
Biaryl Synthesis via Pd-Catalyzed Decarboxylative Coupling of Aromatic Carboxylates with Aryl Halides
作者:Lukas J. Goossen、Nuria Rodríguez、Bettina Melzer、Christophe Linder、Guojun Deng、Laura M. Levy
DOI:10.1021/ja068993+
日期:2007.4.1
with aryl halides. This bimetallic system allows the directcoupling of various aryl, heteroaryl, or vinyl carboxylic acids with aryl or heteroaryl iodides, bromides, or chlorides at 160 degrees C in the presence of a mild base such as potassium carbonate. The present scope and potential economic impact of the reaction are demonstrated by the synthesis of 42 biaryls, some of which are of substantial industrial
提出了一种用于不对称联芳基区域特异性构建的新策略,其中容易获得的羧酸盐原位脱羧,得到芳基金属物质,在与芳基卤化物的催化交叉偶联反应中充当亲核组分。该催化剂体系由一种铜菲咯啉配合物组成,该配合物介导从芳族羧酸盐中挤出 CO2 以生成芳基铜物种,以及一种钯配合物,该配合物催化这些中间体与芳基卤化物的交叉偶联。这种双金属系统允许各种芳基、杂芳基或乙烯基羧酸与芳基或杂芳基碘化物、溴化物或氯化物在 160 摄氏度下在温和碱(如碳酸钾)存在下直接偶联。42 联芳基化合物的合成证明了该反应的当前范围和潜在的经济影响,其中一些具有重要的工业相关性。讨论了新转型的剩余挑战和未来前景。
Palladium/Copper-Catalyzed Decarboxylative Cross-Coupling of Aryl Chlorides with Potassium Carboxylates
作者:Lukas J. Gooßen、Bettina Zimmermann、Thomas Knauber
DOI:10.1002/anie.200800728
日期:2008.9.1
SYNTHESIS OF 2-SUBSTITUTED BIARYLS VIA Cu/Pd-CATALYZED DECARBOXYLATIVE CROSS-COUPLING OF 2-SUBSTITUTED POTASSIUM BENZOATES: 4-METHYL-2'-NITROBIPHENYL AND 2-ACETYL-4'-METHYLBIPHENYL
作者:Gooßen, Lukas J.、Rodríguez, Nuria、Linder, Christophe、Zimmermann, Bettina、Knauber, Thomas、Denmark, Scott E.、Werner, Nathan S.