Cu(<scp>i</scp>) catalysis for selective condensation/bicycloaromatization of two different arylalkynes: direct and general construction of functionalized C–N axial biaryl compounds
enantioselectivity verifies its potential for the simplest asymmetric synthesis of atropoisomeric biaryls. Western blotting demonstrated that the newly developed compounds are promising targets in biology and pharmaceuticals. This unique reaction can construct structurally diverse C–N axial biarylcompounds that have never been reported by other methods, and might be extended to various applications in materials
Exploiting Hydrazones To Improve the Efficiency of 6π-Electrocyclization Reactions of 1-Azatrienes
作者:Matthew P. Ball-Jones、Jasper Tyler、Helena Mora-Radó、Werngard Czechtizky、María Méndez、Joseph P. A. Harrity
DOI:10.1021/acs.orglett.9b02455
日期:2019.9.6
The greater geometric lability of hydrazones compared to that of oximeethers is used as a basis to overcome the reluctance of Z-oxime ether azatrienes to undergo electrocyclization toward the synthesis of borylated (heteroaromatic) pyridines and ring-fused analogues. Such hydrazones now allow access to previously inaccessible tri- and tetrasubstituted 3-borylpyridines in high yields.
A wastebiomass, sodium lignosulfonate, was treated with sodium 2-formylbenzenesulfonate, and the phenylaldehyde condensation product was then used as a robust supportingmaterial to immobilize a copper species. The so-obtained catalyst was characterized by many physicochemical methods including FTIR, EA, FSEM, FTEM, XPS, and TG. This catalyst exhibited excellent catalytic activity in the synthesis
Gold-Catalyzed Ammonium Acetate Assisted Cascade Cyclization of 2-Alkynylarylketones
作者:Maciej E. Domaradzki、Yuhua Long、Zhigang She、Xiaochen Liu、Gan Zhang、Yu Chen
DOI:10.1021/acs.joc.5b01939
日期:2015.11.20
An ammonium acetate assisted gold-catalyzedcascadecyclization reaction of 2-alkynylarylketones is described. Under the reported conditions, a gold-catalyzed intramolecular cyclization of 2-alkynylarylketones takes place through two competing reaction mechanisms—a 5-exo-dig or a 6-endo-dig cyclization—leading to two regioisomeric intermediates: isobenzofuranium or isobenzopyrylium. In the presence
Diastereo‐ and Enantioselective Synthesis of Bisbenzannulated Spiroketals and Spiroaminals by Ir/Ag/Acid Ternary Catalysis
作者:Wu‐Lin Yang、Xin‐Yu Shang、Tao Ni、Hui Yan、Xiaoyan Luo、Hanliang Zheng、Zhong Li、Wei‐Ping Deng
DOI:10.1002/anie.202210207
日期:2022.10.17
allylation/spiroketalization cascade reaction of o-alkynylacetophenones and (1-hydroxyallyl)phenols enabled by Ir/Ag/acidternarycatalysis was developed, affording structurally diverse bisbenzannulated [6,6]-spiroketals in high efficiency with mostly high diastereoselectivities and excellent enantioselectivities.