Palladium-Catalyzed (Ullmann-Type) Homocoupling of Aryl Halides: A Convenient and General Synthesis of Symmetrical Biaryls via Inter- and Intramolecular Coupling Reactions
摘要:
[GRAPHICS]A convenient new procedure is described for both inter- and intramolecular homocoupling of aryl halides (Ullmann reaction) using catalytic palladium in the presence of hydroquinone, a homogeneous reductant. Optimal conditions for the reductive coupling include the use of a 1:1 molar ratio of Pd(OAc)(2) and As(o-tolyl)(3) in catalytic amounts under basic conditions.
Palladium-Catalyzed Regiocontrolled Domino Synthesis of <i>N</i>-Sulfonyl Dihydrophenanthridines and Dihydrodibenzo[<i>c</i>,<i>e</i>]azepines: Control over the Formation of Biaryl Sultams in the Intramolecular Direct Arylation
作者:Joydev K. Laha、Neetu Dayal、Roli Jain、Ketul Patel
DOI:10.1021/jo501910q
日期:2014.11.21
A palladium-catalyzed domino N-benzylation/intramolecular directarylation involving sulfonanilides and 2-bromobenzyl bromides has been developed for the first time, providing a workable access to N-sulfonyl dihydrophenanthridines in good to excellent yields. Under the optimized conditions, the formation of 5,6-dihydrophenanthridines was largely controlled over the formation of biaryl sultams containing
Palladium‐catalyzed Intramolecular Coupling Reactions between Vinyl Bromides, Aryl and Vinyl Halides, and Aryl Iodides Mediated by Indium: Preparation of Five‐ to Eight‐membered Carbocycles and Heterocycles
作者:Woo Hyung Jeon、Hyunseok Kim、Jang‐Sik Choi、Kooyeon Lee、Phil Ho Lee