Intramolecular Palladium-Catalyzed Alkane C−H Arylation from Aryl Chlorides
作者:Sophie Rousseaux、Michaël Davi、Julien Sofack-Kreutzer、Cathleen Pierre、Christos E. Kefalidis、Eric Clot、Keith Fagnou、Olivier Baudoin
DOI:10.1021/ja1048847
日期:2010.8.11
efficient and general palladium-catalyzed intramolecular C(sp(3))-H arylation of (hetero)aryl chlorides, giving rise to a variety of valuable cyclobutarenes, indanes, indolines, dihydrobenzofurans, and indanones, are described. The use of aryl and heteroaryl chlorides significantly improves the scope of C(sp(3))-H arylation by facilitating the preparation of reaction substrates. Careful optimization studies
Photochemical Rearrangement of <i>N</i>-Chlorolactams: A Route to <i>N</i>-Heterocycles through Concerted Ring Contraction
作者:Dana K. Winter、Alexandre Drouin、Jean Lessard、Claude Spino
DOI:10.1021/jo100181h
日期:2010.4.16
We report a novel ringcontraction allowing the direct conversion of N-chlorolactams to their corresponding ring-contraction N-heterocycles upon photolysis. Results show that the rearrangement occurs with a variety of N-chlorolactams and that the greater the substitution at the migrating carbon, the greater the yield of product. Importantly, stereochemistry at the migrating carbon is conserved in the
Palladium-Catalyzed sp<sup>3</sup> C—H Activation of Simple Alkyl Groups: Direct Preparation of Indoline Derivatives from <i>N</i>-Alkyl-2-bromoanilines
The sp3 C-H activation of a simple alkyl group catalyzed by palladium(0) provides a novel and convenient strategy for the synthesis of various indolinesfrom simple precursors, such as N-alkyl-2-bromoanilines. This study demonstrates that assisting moieties in the substrate such as a pyridine or quaternary carbon are not always necessary for sp3 C-H activation.
C−Harylation: Batch and continuous-flow protocols are developed for the first time for intramolecular Pd0-catalyzed C(sp3)−H activation/cyclization using a heterogeneousreusable palladium(II)-bis(N-heterocyclic carbene) catalyst.