Selective Acylation of Aryl- and Heteroarylmagnesium Reagents with Esters in Continuous Flow
作者:Benjamin Heinz、Dimitrije Djukanovic、Maximilian A. Ganiek、Benjamin Martin、Berthold Schenkel、Paul Knochel
DOI:10.1021/acs.orglett.9b04254
日期:2020.1.17
A selectiveacylation of readily accessible organomagnesium reagents with commercially available esters proceeds at convenient temperatures and short residence times in continuous flow. Flow conditions allow us to prevent premature collapse of the hemiacetal intermediates despite noncryogenic conditions, thus furnishing ketones in good yields. Throughout, the coordinating ability of the ester and/or
A Zwitterionic Palladium(II) Complex as a Precatalyst for Neat-Water-Mediated Cross-Coupling Reactions of Heteroaryl, Benzyl, and Aryl Acid Chlorides with Organoboron Reagents
A zwitterionic palladium(II) complex has been found to be an efficient catalyst for Suzuki–Miyaura cross‐coupling reactions of aryl and heteroaryl organoboron reagents with various heteroaryl chlorides, aryl‐ and heteroarylmethyl chlorides, and aryl acid chlorides in neat water.
Transition-metal-free, ambient-pressure carbonylative cross-coupling reactions of aryl halides with potassium aryltrifluoroborates
作者:Fengli Jin、Wei Han
DOI:10.1039/c5cc01968k
日期:——
We disclose an unprecedented transition-metal-free carbonylative cross coupling of arylhalides with potassium aryl trifluoroborates even at atmospheric pressure of carbon monoxide. This protocol is efficient, operationally simple, and shows...
Pd-Catalyzed Suzuki-Miyaura Cross-Coupling of Arylboronic Acids and α-Iminonitriles through C-CN Bond Activation
作者:Kui Liu、Shou-Wei Tao、Chun Qian、Yong-Ming Zhu
DOI:10.1002/ejoc.201800857
日期:2018.9.16
A valuable method for the Pd‐catalyzed Suzuki–Miyaura cross‐coupling of arylboronicacids has been developed, using α‐iminonitriles to replace acylnitriles. The reaction proceeds through selective activation of the C–CNbond, and avoids the “decarbonylation” side reaction of acylnitriles after activation.