Copper-Catalyzed Diaryl Ether Formation from (Hetero)aryl Halides at Low Catalytic Loadings
作者:Yuntong Zhai、Xiaofei Chen、Wei Zhou、Mengyang Fan、Yisheng Lai、Dawei Ma
DOI:10.1021/acs.joc.7b00493
日期:2017.5.5
Diaryl formation is achieved by coupling phenols and (hetero)aryl halides under the catalysis of CuI/N,N′-bis(2-phenylphenyl) oxalamide (BPPO) or CuI/N-(2-phenylphenyl)-N′-benzyl oxalamide (PPBO) at 90 °C using DMF or MeCN as the solvent. Only 0.2–2 mol % CuI and ligand are required for complete conversion, which represents the lowest catalytic loadings for a general Cu/ligand-catalyzed diaryl ether
Trifluoromethylation of haloarenes with a new trifluoro-methylating reagent Cu(O<sub>2</sub>CCF<sub>2</sub>SO<sub>2</sub>F)<sub>2</sub>
作者:Gang Zhao、Hao Wu、Zhiwei Xiao、Qing-Yun Chen、Chao Liu
DOI:10.1039/c6ra09011g
日期:——
A new trifluoromethylating reagent Cu(O2CCF2SO2F)2, which easily decomposes to generate active CuCF3 species in DMF at room temperature, has been conveniently prepared from inexpensive starting materials on scale. This new...
The present invention relates to substituted 1,3,8-triazaspiro[4.5]decame-2,4-diones useful as HIF prolyl hydroxylase inhibitors to treat anemia and like conditions.
Barbier type reaction with lithium metal has been tested under sonication on pyridines, a cinnoline and on various diazines. This very convenient method allows a very fast and smooth functionalization of these heterocycles.
A mild catalytic system for radical conjugate addition of nitrogen heterocycles
作者:R. A. Aycock、H. Wang、N. T. Jui
DOI:10.1039/c7sc00243b
日期:——
The direct addition of pyridine and diazine units to electron-poor alkenes has been achieved via a redox radical mechanism that is enabled by limiting the effective concentration of the hydrogen-atom source. The described method is tolerant of acidic functional groups and is generally applicable to the union of a wide range of Michael acceptors and 6-membered heterocyclic halides.