Synthesis of Phthalides through Tandem Rhodium-Catalyzed C-H Olefination and Annulation of Benzamides
作者:Neeraj Kumar Mishra、Jihye Park、Miji Choi、Satyasheel Sharma、Hyeim Jo、Taejoo Jeong、Sangil Han、Saegun Kim、In Su Kim
DOI:10.1002/ejoc.201600368
日期:2016.6
The rhodium(III)-catalyzed tandem C–H olefination and cyclization of benzamides with various alkenes is described. This protocol provides direct access to highly substituted phthalides, which are known as crucial frameworks of biologically active compounds. In particular, the amide directing group containing a benzimidazole group facilitates the activation of aromatic ortho-C–H bonds leading to olefination
Urea‐Substituted Tetramethylcyclopentadienyl Ligands for Supramolecularly Accelerated Rh
<sup>III</sup>
‐Catalyzed
<i>ortho</i>
‐C−H Olefination of Benzoic Acid Derivatives
作者:David Maurer、Bernhard Breit
DOI:10.1002/chem.202005130
日期:2021.2.5
Through kinetic studies and NMR titration experiments, the catalysts’ substrate recognition ability mediated by hydrogenbonding was identified to be the reason for this effect. Introduction of pyridone‐phosphine ligands capable of forming additional H‐bond interactions increased the catalytic performance even further. By unveiling a proportionality between reaction rate and relative complex formation
Under rhodium(III)-catalyzed conditions, a broad range of benzoic acids reacted with acrylates successfully to provide phthalides through the direct functionalization of a C–H bond followed by β-hydride elimination and intramolecular Michael addition. The reaction provides an alternative strategy for the construction of diverse and useful phthalide derivatives from readily available starting materials