Oxalohydrazide Ligands for Copper‐Catalyzed C−O Coupling Reactions with High Turnover Numbers
作者:Ritwika Ray、John F. Hartwig
DOI:10.1002/anie.202015654
日期:2021.4.6
long‐lived copper catalysts for couplings that form the C−O bonds in biaryl ethers. These Cu‐catalyzed coupling of phenols with aryl bromides occurred with turnovers up to 8000, a value which is nearly two orders of magnitude higher than those of prior couplings to form biaryl ethers and nearly an order of magnitude higher than those of any prior copper‐catalyzed coupling of aryl bromides and chlorides
Transition-Metal-Free Intramolecular Carbene Aromatic Substitution/Büchner Reaction: Synthesis of Fluorenes and [6,5,7]Benzo-fused Rings
作者:Zhenxing Liu、Haocheng Tan、Long Wang、Tianren Fu、Ying Xia、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201409982
日期:2015.3.2
Intramoleculararomaticsubstitution and Büchner reaction have been established as powerful methods for the construction of polycyclic compounds. These reactions are traditionally catalyzed by RhII catalysts with α‐diazocarbonyl compounds as the substrates. Herein a transition‐metal‐free intramoleculararomaticsubstitution/Büchner reaction is presented. These reactions use readily available N‐tosylhydrazones
Discovery of Pyrazine-Carboxamide-Diphenyl-Ethers as Novel Succinate Dehydrogenase Inhibitors via Fragment Recombination
作者:Hua Li、Meng-Qi Gao、Yan Chen、Yu-Xia Wang、Xiao-Lei Zhu、Guang-Fu Yang
DOI:10.1021/acs.jafc.0c05646
日期:2020.11.25
and recombined to produce a pyrazine-carboxamide-diphenyl-ether scaffold as a new SDHI. After substituent optimization, compound 6y was successfully identified with good inhibitoryactivity against porcine SDH, which was about 2-fold more potent than pyraziflumid. Furthermore, compound 6y exhibited 95% and 80% inhibitory rates against soybean gray mold and wheat powdery mildew at a dosage of 100 mg/L
Ruthenium-catalyzed alkenylation of 2'-alkoxyacetophenones with alkenylboronates provides ortho C-H alkenylation products without sacrificing an ether functional group at the other ortho position. Both excellent chemoselectivity and high product yields are achieved with an aryloxo ruthenium complex. The effective suppression of the C-O bond cleavage was attained by coordination of the alkenyl moiety in the C-H alkenylation product to the ruthenium center.
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作者:BUSHELL M. J.、 BEAUTEMENT K.、 CLOUGH J. M.、 DEFRAINE P.、 ANTHONY V. M.、 G+