Scope of the Palladium-Catalyzed Aryl Borylation Utilizing Bis-Boronic Acid
作者:Gary A. Molander、Sarah L. J. Trice、Steven M. Kennedy、Spencer D. Dreher、Matthew T. Tudge
DOI:10.1021/ja303181m
日期:2012.7.18
wasteful reagents to prepare boronic acid derivatives and require additional steps to afford the desired boronic acid. The scope of the previously reported palladium-catalyzed, direct boronic acid synthesis is unveiled, which includes a wide array of synthetically useful aryl electrophiles. It makes use of the newly available second generation Buchwald XPhos preformed palladium catalyst and bis-boronic
Synthesis of Functionalized Quinolines through a Reaction of Amides and Alkynes Promoted by Triflic Anhydride/Pyridine
作者:Lian-Hua Li、Zhi-Jie Niu、Yong-Min Liang
DOI:10.1002/chem.201703832
日期:2017.11.2
A concise, novel and flexible metal‐free single step to synthesize functionalized quinolines is reported. Triflic anhydride‐mediated (Tf2O) activation of amides is discussed in the presence of pyridine to offer strong electrophiles, thereby showcasing excellent productivity, high regio‐ and chemoselectivity, and widely tolerable substrates. This approach provides a straightforward and efficient way
Synthesis of Quinolines through Three-Component Cascade Annulation of Aryl Diazonium Salts, Nitriles, and Alkynes
作者:Hao Wang、Qian Xu、Sheng Shen、Shouyun Yu
DOI:10.1021/acs.joc.6b02509
日期:2017.1.6
An efficient and rapid synthesis of multiply substituted quinolines is described. This method is enabled by a three-component cascade annulation of readily available aryl diazonium salts, nitriles, and alkynes. This reaction is catalyst- and additive-free. Various aryl diazonium salts, nitriles, and alkynes can participate in this transformation, and the yields are up to 83%.
Scope of the Two-Step, One-Pot Palladium-Catalyzed Borylation/Suzuki Cross-Coupling Reaction Utilizing Bis-Boronic Acid
作者:Gary A. Molander、Sarah L. J. Trice、Steven M. Kennedy
DOI:10.1021/jo301642v
日期:2012.10.5
synthesis of boronic acids has greatly facilitated the two-step, one-potborylation/Suzukicross-couplingreaction between aryl and heteroaryl halides. With use of Buchwald’s second-generation XPhos preformed catalyst, high yields of cross-coupled products were obtained for most substrates. The method also allows an efficient two-step, one-pot synthesis, providing access to three distinct cross-coupled
Practical One-Pot Preparation of Magnesium Di(hetero)aryl- and Magnesium Dialkenylboronates for Suzuki-Miyaura Cross-Coupling Reactions
作者:Benjamin A. Haag、Christoph Sämann、Anukul Jana、Paul Knochel
DOI:10.1002/anie.201103022
日期:2011.8.1
Mg for B: An atom‐economical one‐potsynthesis by direct magnesium insertion in the presence of B(OBu)3 and LiCl allows a broad range of functionalized (hetero)aryl and alkenyl bromides to be converted into magnesium diorganoboronates 2, which undergo Suzuki–Miyauracross‐couplingreactions with various aryl (pseudo)halides (see scheme). Both aryl groups of 2 are transferred and furnish the products