A mild and efficient protocol for the synthesis of 2,2′-difunctional biaryls from readily available benzamides and oximes by Co(OAc)2·4H2O catalysis has been developed. The catalytic cycle that includes aerobic oxidation of Co(I) to Co(III) is successfully achieved for the first time through dual-chelation-assisted C–H/C–H coupling with the assistance of catalytic Mn(acac)3. The catalytic system exhibits
method for synthesis of oximes from aldehydes or ketones with N-hydroxyphthalimide or N-hydroxysuccinimide in water has been described. It is the first time to utilize NHPI as an oximation reagent to synthesize aldoximes and ketoximes from the corresponding organic carbonyl compounds without other reagents. The reaction tolerates various functional groups and affords the corresponding oximes in 76%–98% yields
Provided herein are novel and useful compounds having a tryptase inhibition activity, pharmaceutical compositions comprising such compounds, and methods treating subjects suffering from a condition, disease, or disorder that can be ameliorated by the administration of an inhibitor of tryptase, e.g., asthma and inflammatory diseases, to name only a few.
One-pot synthesis of 2-amino-3,4-dicyanopyridines from ketoximes and tetracyanoethylene via Cu(I)-catalyzed cyclization
作者:Ziwei Han、Jianguang Lv、Jianmin Zhang
DOI:10.1016/j.tet.2019.02.032
日期:2019.4
A novel approach to 2-amino-3,4-dicyanopyridines has been discovered fromCu(I)-catalyzed cyclizations of simple and easily available ketoximes and tetracyanoethylene (TCNE). The complexed radical mechanism involves cleavage of several OH/NO/CH bonds, and new CC/CN bonds formation. A wide variety of substrates with different functional groups could be smoothly converted into the corresponding products
从Cu(I)催化的简单易得的酮肟和四氰基乙烯(TCNE)的环化反应中发现了一种2-氨基-3,4-二氰基吡啶的新颖方法。复杂的自由基机制涉及几个O H / N O / C H键的断裂,以及新的C C / C N键的形成。可以将具有不同官能团的多种底物以中等收率平稳地转化为相应的产品。
Copper-catalyzed synthesis of oxime ethers from iminoxy radical (C N–O ) and maleimides via radical addition
identified copper catalyst enables the formation of oxime radicals (N–O) by cleaving the O–H bond in ketoximes, followed by the radical addition to N-substituted maleimides. The oxime radicals (N–O) were detected and confirmed by EPR spectroscopy and variable-temperature 1H NMR. The simple one-pot reaction realizes the facile preparation of a variety of oximeether adduct products in moderate to good yields
已经实现了高效的Cu(II)催化的马来酰亚胺自由基加成。鉴定出的铜催化剂可通过裂解酮肟中的O-H键,然后将自由基添加到N-取代的马来酰亚胺中,从而形成肟自由基(N-O )。通过EPR光谱和可变温度1 H NMR检测并确认了肟自由基(NO )。简单的一锅反应可轻松制备中度到良好收率的各种肟醚加合物产物。