Palladium-Catalyzed Intra- and Intermolecular C–H Arylation Using Mesylates: Synthetic Scope and Mechanistic Studies
作者:Devin M. Ferguson、Stacey R. Rudolph、Dipannita Kalyani
DOI:10.1021/cs500587b
日期:2014.7.3
This paper describes the development of Pd-catalyzed inter- and intramolecular direct arylation using mesylates. Furthermore, a sequential mesylation/arylation protocol using phenols as substrates is described. These transformations are general with respect to the electronics of the C-H substrates and allow for the synthesis of diverse heterocyclic motifs in good yields. Both arenes and heteroarenes
Iron(0)-Catalyzed Transfer Hydrogenative Condensation of Nitroarenes with Alcohols: A Straightforward Approach to Benzoxazoles, Benzothiazoles, and Benzimidazoles
作者:Ramachandra Reddy Putta、Simin Chun、Seung Hyun Choi、Seok Beom Lee、Dong-Chan Oh、Suckchang Hong
DOI:10.1021/acs.joc.0c02191
日期:2020.12.4
the redox condensation of o-hydroxynitrobenzene with alcohol, leading to the formation of benzoxazole derivatives. A wide range of 2-substituted benzoxazoles were synthesized in good to excellent yields without the addition of an external redox agent. A series of control experiments provided a plausible mechanism. Furthermore, the reaction system was successfully extended to the synthesis of benzothiazoles
Palladium-Catalyzed Direct Arylation of Heteroarenes with Aryl Mesylates
作者:Chau Ming So、Chak Po Lau、Fuk Yee Kwong
DOI:10.1002/chem.201002354
日期:2011.1.17
Not so challenging after all! The first general examples of the directarylation of heteroarenes by using challenging aryl mesylates as electrophiles are disclosed. These easy reaction conditions also allow the functionalization of other heterocycles, such as caffeine, triazole and benzathiazole (see scheme).
bisphosphine monochelation to transition metals under conditions where homogeneousligands may form bischelated single metal complexes or multinuclear complexes. PS-DPPBz showed high ligand performance in first-row transition metal catalysis, enabling challenging molecular transformations that were not possible through the screening of existing homogeneousligands. In the Ni-catalyzed amination of aryl
Continuous flow/waste-minimized synthesis of benzoxazoles catalysed by heterogeneous manganese systems
作者:Francesco Ferlin、Mitchell K. van der Hulst、Stefano Santoro、Daniela Lanari、Luigi Vaccaro
DOI:10.1039/c9gc01641d
日期:——
Herein, we present our results on the development of a waste minimized protocol for the synthesis of 2-arylbenzoxazoles in continuous flow by combining safe solvent and heterogeneous manganese-based catalyst.