Results 51 to 60 of about 33,950 (227)

Bulky-yet-flexible carbene ligands and their use in palladium cross-coupling [PDF]

, 2019
In recent years, several classes of new N-heterocyclic carbene (NHC) ligands were developed around the concept of flexible steric bulk. The steric hindrance of these ligands brings stability to the active species, while ligand flexibility still allows ...
Cazin, Catherine, Nahra, Fady, Vanden Broeck, Sofie   +2 more
core   +1 more source

Direct catalytic arylation of heteroarenes with meso-bromophenyl-substituted porphyrins

Beilstein Journal of Organic Chemistry, 2017
The arylation of mono-, di- and tetra-meso-bromophenyl-substituted porphyrins with the heteroarenes containing “acidic” C–H bonds, such as benzoxazole, benzothiazole and N-methylimidazole was studied in the presence of three alternative catalytic systems:
Alexei N. Kiselev, Olga K. Grigorova, Alexei D. Averin, Sergei A. Syrbu, Oskar I. Koifman, Irina P. Beletskaya   +5 more
doaj   +1 more source

Diamine ligands in copper-catalyzed reactions [PDF]

, 2010
The utility of copper-mediated cross-coupling reactions has been significantly increased by the development of mild reaction conditions and the ability to employ catalytic amounts of copper.
Buchwald, Stephen Leffler, Surry, David S.   +1 more
core   +2 more sources

Methoxy-Directed Aryl-to-Aryl 1,3-Rhodium Migration [PDF]

Journal of the American Chemical Society, 2013
Through-space metal/hydrogen shift is an important strategy for transition-metal-catalyzed C-H bond activation. Here we describe the synthesis and characterization of a Rh(I) 2,6-dimethoxybenzoate complex that underwent stoichiometric rearrangement via a highly unusual 1,3-rhodium migration.
Jing, Zhang, Jun-Feng, Liu, Angel, Ugrinov, Anthony F X, Pillai, Zhong-Ming, Sun, Pinjing, Zhao   +5 more
openaire   +2 more sources

Birch reductive arylation by mechanochemical anionic activation of polycyclic aromatic compounds

Nature Communications
Birch reduction is a well-known process for transforming aromatic compounds. The reduction of aromatic rings using alkali metals produces anionic species that react with protons or electrophiles.
Yoshifumi Toyama, Akiko Yagi, Kenichiro Itami, Hideto Ito   +3 more
doaj   +1 more source

Direct Functionalization of Nitrogen Heterocycles via Rh-Catalyzed C−H Bond Activation [PDF]

, 2008
Nitrogen heterocycles are present in many compounds of enormous practical importance, ranging from pharmaceutical agents and biological probes to electroactive materials.
Alberico D., Alonso F., Alvarez E., Bellina F., Bercaw J. E., Bergman R. G., Campeau L.-C., Canac Y., Chang L. L., Chatani N., Chen M. S., Chiong H. A., Cho J. -Y., Christ M. L., Clement N. D., Crabtree R. H., Daugulis O., Daugulis O., Diederich F., Do H.-Q., Dwyer C. L., Dyker G., Esteruelas M. A., Ferreira E. M., Gant T. G., Garcia-Cuadrado D., Graczyk P. P., Gribble M., Herrmann W. A., Hillier A. C., Hlasta D. J., Ishiyama T., Jia C. G., Johnson J. B., Kakiuchi F., Kakiuchi F., Kalyani D., Klingler R. J., Kreher R., Larhed M., Lewis J. C., Lewis J. C., Lewis J. C., Lewis J. C., Michael J. P., Miura M., Moore E. J., Netherton M. R., Peters M. W., Pivsa-Art S., Rech J. C., Ritleng V., Stuart D. R., Tan K. L., Tan K. L., Tan K. L., Tan K. L., Tan K. L., Tunge J. A., van Assema S. G. A., Wiedemann S. H., Wiedemann S. H., Wiedemann S. H., Yanagisawa S., Zharekeev B. K.   +64 more
core   +2 more sources

Research on synthesis of microwave‐assisted heterocyclic compounds with eco‐friendly solvents and transition metals via C–H activation

Bulletin of the Korean Chemical Society, EarlyView.
This review summarizes microwave‐assisted transition‐metal catalysis for constructing N‐ and O‐heterocycles, highlighting rapid C–H and pre‐activated C–X activation, improved selectivity, and green synthetic efficiency. Abstract Microwave‐assisted organic synthesis provides a rapid and sustainable platform for synthesizing various heterocycles ...
Woo‐Jin Park, Ye Ri Han, Hyejeong Lee
wiley   +1 more source

Palladium-catalyzed dual C–H or N–H functionalization of unfunctionalized indole derivatives with alkenes and arenes

Beilstein Journal of Organic Chemistry, 2012
This review highlights the development of palladium-catalyzed C–H and N–H functionalization reactions involving indole derivatives. These procedures require unactivated starting materials and are respectful of the basic principle of sustainable chemistry
Gianluigi Broggini, Egle M. Beccalli, Andrea Fasana, Silvia Gazzola   +3 more
doaj   +1 more source

Recent progress in metal assisted multicomponent reactions in organic synthesis

Frontiers in Chemistry, 2023
To prepare complicated organic molecules, straightforward, sustainable, and clean methodologies are urgently required. Thus, researchers are attempting to develop imaginative approaches.
Kokila Sakthivel, R. J. Gana, Toshitaka Shoji, Naoko Takenaga, Toshifumi Dohi, Fateh V. Singh   +5 more
doaj   +1 more source

One pot Pd(OAc)2-catalysed 2,5-diarylation of imidazoles derivatives [PDF]

, 2014
International audienceThe regioselective 2- or 5-arylation of imidazole derivatives with aryl halides using palladium catalysts has been described in recent years; whereas the arylation at both C2 and C5 carbons of imidazoles in high yields has not been ...
Dixneuf, Pierre H., Doucet, Henri, Soulé, Jean-François, Takfaoui, Abdelilah, Touzani, Rachid, Zhao, Liqin   +5 more
core   +3 more sources