Stand and deliver: The first highly regio‐ and enantioselective bromoamination of chalcones has been developed which proceeds via an unusual bromonium‐based mechanism to deliver the title compounds. Excellent results were obtained using 0.05 mol % of the C2‐symmetric N,N′‐dioxide/scandium(III) complex under mild conditions (see scheme).
Transition Metal-Catalyzed Regio- and Stereoselective Aminobromination of Olefins with TsNH<sub>2</sub> and NBS as Nitrogen and Bromine Sources
作者:Vinay V. Thakur、Siva Kumar Talluri、A. Sudalai
DOI:10.1021/ol027530f
日期:2003.3.1
for aminohalogenation of olefins has been developed for the preparation of vicinal haloamine derivatives in high yields by using Cu, Mn, or V catalysts with p-toluenesulfonamide (TsNH(2)) and N-bromosuccinimide (NBS) as nitrogen and brominesources, respectively. Unprecedented regio- and stereoselectivity (anti:syn > 99:1) toward the aminohalogenation process is shown for olefinic substrates as well
Aminohalogenation of Electron-Deficient Olefins Promoted by Hypervalent Iodine Compounds
作者:Xue-Liang Wu、Guan-Wu Wang
DOI:10.1002/ejoc.200800842
日期:2008.12
An efficient and practical procedure for the aminohalogenation of electron-deficientolefinspromoted by hypervalentiodinecompounds has been demonstrated. The catalytic efficiency of various hypervalentiodinecompounds with different carboxylic and sulfonic ligands has also been investigated and of these (diacetoxyiodo)benzene exhibited the highest activity. A series of substrates, including α,β-unsaturated
Aminobromination of olefins with TsNH<sub>2</sub>and NBS as the nitrogen and bromine sources mediated by hypervalent iodine in a ball mill
作者:Xue-Liang Wu、Jing-Jing Xia、Guan-Wu Wang
DOI:10.1039/b717333d
日期:——
A series of olefins including α,β-unsaturated ketones, cinnamates, cinnamides and styrenes have been aminobrominated with good yields and excellent diastereoselectivities under mechanical milling conditions, using TsNH2 and NBS as the nitrogen and bromine sources, promoted by (diacetoxyiodo)benzene.
Aluminium Powder-Catalyzed Regio- and Stereoselective Aminobromination of α,β-Unsaturated Carbonyl Compounds and Simple Olefins with the<i>p</i>-Toluenesulfonamide/<i>N</i>-Bromosuccinimide (TsNH<sub>2</sub>-NBS) System
作者:Zhan-Guo Chen、Jun-Fa Wei、Ming-Zhen Wang、Li-Yan Zhou、Cong-Jie Zhang、Xian-Ying Shi
DOI:10.1002/adsc.200900343
日期:2009.10
The regio- and stereoselective aminobromination of α,β-unsaturated carbonyl compounds and simple olefins catalyzed by elementary aluminium powder has been established by using p-toluenesulfonamide (TsNH2) and N-bromosuccinimide (NBS) as the nitrogen/bromine sources. The reaction was convenient to carry out with a loading of 1 mol% catalyst at room temperature without inert gas protection. This method