AN EFFICIENT AND SELECTIVE METHOD FOR CONVERSION OF OXIMES AND SEMICARBAZONES TO THE CORRESPONDING CARBONYL COMPOUNDS UNDER SOLVENT-FREE CONDITIONS
作者:A. R. Hajipour、S. E. Mallakpour、I. Mohammadpoor-Baltork、S. Khoee
DOI:10.1081/scc-100104002
日期:2001.1.1
1-Benzyl-4-aza-1-azoniabicyclo[2.2.2]octane dichromate (BAABCD) is a useful reagent for selective conversion of oximes and semicarbazones to the corresponding carbonyl compounds. The reaction was carried out under solventfree conditions and in the presence of a catalytic amount of aluminum chloride.
C3-Arylation of indoles with aryl ketones <i>via</i> C–C/C–H activations
作者:Zi-Qiong Guo、Hui Xu、Xing Wang、Zhen-Yu Wang、Biao Ma、Hui-Xiong Dai
DOI:10.1039/d1cc03954g
日期:——
C3-Arylation of indoles with aryl ketones is accomplished via palladium-catalyzed ligand-promoted Ar–C(O) cleavage and subsequent C–H arylation of indole. Various (hetero)aryl ketones are compatible in this reaction, affording the corresponding 3-arylindoles in moderate to good yields. Further introduction of an indole moiety into the natural products desoxyestrone and evodiamine demonstrate the synthetic
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。
An Electrochemical Beckmann Rearrangement: Traditional Reaction via Modern Radical Mechanism
作者:Li Tang、Zhi‐Lv Wang、Yan‐Hong He、Zhi Guan
DOI:10.1002/cssc.202001553
日期:2020.9.18
electrochemical Beckmannrearrangement, i. e. the direct electrolysis of ketoximes to amides, is presented for the first time. Using a constant current as the driving force, the reaction can be easily carried out under neutral conditions at room temperature. Based on a series of mechanistic studies, a novel radical Beckmannrearrangementmechanism is proposed. This electrochemical Beckmannrearrangement does
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。