Conditions for the palladium-catalyzed directarylation of a wide range of heterocycles with aryl bromides are reported. Those conditions employ a stoichiometric ratio of both coupling partners, as well as a substoichiometric quantity of pivalicacid, which results in significantly faster reactions. An evaluation of the influence of the nature of the aryl halide has also been carried out.
The present invention relates to compositions containing a zinc complex wherein a zinc atom carries two amide ligands, a lithium salt and a defined solvent. The compositions are stable and show high activity as reactants for metalation reactions, and thus provide a valuable tool in organic synthesis. Moreover, the invention relates to processes for the preparation of the compositions and to synthetic procedures using them.
Rh(III)-Catalyzed Decarboxylative <i>ortho</i>-Heteroarylation of Aromatic Carboxylic Acids by Using the Carboxylic Acid as a Traceless Directing Group
作者:Xurong Qin、Denan Sun、Qiulin You、Yangyang Cheng、Jingbo Lan、Jingsong You
DOI:10.1021/acs.orglett.5b00532
日期:2015.4.3
ortho-heteroarylation of aromatic carboxylicacids with various heteroarenes has been developed through Rh(III)-catalyzed two-fold C–H activation, which exhibits a wide substrate scope of both aromatic carboxylicacids and heteroarenes. The use of naturally occurring carboxylicacid as the directinggroup avoids troublesome extra steps for installation and removal of an external directinggroup.