An Electrophilic Approach to the Palladium-Catalyzed Carbonylative C–H Functionalization of Heterocycles
作者:Jevgenijs Tjutrins、Bruce A. Arndtsen
DOI:10.1021/jacs.5b07098
日期:2015.9.23
highly electrophilic intermediates. Overall, this provides with an atom-economical and general synthetic route to generate aryl-(hetero)aryl ketones using stable reagents (aryl iodides and CO) and without the typical need to exploit pre-metalated heterocycles in carbonylativecoupling chemistry.
The compounds are of the class of 5-aroyl-pyrrole alkanoic acids and corresponding acid derivatives thereof useful as anti-inflammatory agents and as synthetic intermediates.
这些化合物属于5-芳酰基吡咯烷基酸及其相应酸衍生物类,可作为抗炎药物和合成中间体。
Friedel−Crafts Acylation of Pyrroles and Indoles using 1,5-Diazabicyclo[4.3.0]non-5-ene (DBN) as a Nucleophilic Catalyst
作者:James E. Taylor、Matthew D. Jones、Jonathan M. J. Williams、Steven D. Bull
DOI:10.1021/ol1025348
日期:2010.12.17
1,5-Diazabicyclo[4.3.0]non-5-ene (DBN) has been shown to be an effective catalyst for the regioselective Friedel−Crafts C-acylation of pyrroles and indoles in high yields. A detailed mechanistic study implies that DBN is acting as a nucleophilic organocatalyst, with the X-ray crystal structure of a key N-acyl-amidine intermediate having been determined for the first time.
<i>β</i>
‐Selective C−H Arylation of Electron‐Deficient Thiophenes, Pyrroles, and Furans
作者:Luo‐Yan Liu、Jennifer X. Qiao、William R. Ewing、Kap‐Sun Yeung、Jin‐Quan Yu
DOI:10.1002/ijch.201900134
日期:2020.3
A general β‐C−Harylation of electron‐deficient thiophenes, pyrroles, and furans has been developed using ligand‐modulated palladium catalyst. The use of a modified norbornene is crucial for reversing the conventional α‐selectivity of these substrates. This method features good yields, high β‐selectivity, and good tolerance of functional groups.