已经开发了由烯烃的氨基卤化反应生成的1,2-邻位卤胺的尿素催化叠氮化。通过在空气中于室温下简单研磨底物,K 2 CO 3和催化量的尿素的固体混合物来进行这种快速而简单的方法。该反应提供了用于定量制备烯烃的大量氨基卤代衍生物(包括α,β-不饱和酮,α,β-不饱和酯和简单烯烃)中的氮丙啶的方案。对于该反应,已经提出了可能涉及氢键促进去质子化的机理。
Various C–C and C‐X bonds could be formed by doublefunctionalization of olefins featuring Cu‐mediated assistedtandemcatalysis. Furthermore, one‐pot indoline syntheses with o‐bromostyrenes as an application could be achieved.
Catalyst-Free and Metal-Free Electrophilic Bromoamidation of Unactivated Olefins Using the <i>N</i>-Bromosuccinimide/Sulfonamide Protocol
作者:Wesley Zongrong Yu、Feng Chen、Yi An Cheng、Ying-Yeung Yeung
DOI:10.1021/jo502416r
日期:2015.3.6
An efficient, catalyst-free, and metal-free bromoamidation of unactivated olefins has been developed. 4-(Trifluoromethyl)benzenesulfonamide and N-bromosuccinimide were used as the nitrogen and halogen sources, respectively. The methodology is applicable to both cyclic and aliphatic olefins.
proceeds rapidly under mild conditions with high regioselectivity. Olefins react with TsNBr2 in moist THF to form δ-amino ether at roomtemperature. Treatment of TsNBr2 with olefin in MeCN at roomtemperature produced imidazoline in high yield. Further modification of the reaction condition resulted in the development of a one-step procedure for the synthesis of N-acetyl,N′-tosyl diamine derivatives directly
已经发现N,N-二溴-对甲苯磺酰胺(TsNBr 2)是用于各种氨基官能化反应的有效试剂。该试剂既可作为亲电子溴源,也可作为胺在不同条件下与烯烃反应,从而产生氨基醚,咪唑啉,二胺和氨基溴。该反应在温和条件下以高区域选择性快速进行。烯烃与TsNBr 2在潮湿的THF中反应,在室温下形成δ-氨基醚。在室温下,在MeCN中用烯烃处理TsNBr 2可以高产率生产咪唑啉。反应条件的进一步改变导致了一步合成步骤的发展。N-乙酰基,N'-甲苯磺酰基二胺衍生物直接来自烯烃。当烯烃与2.4摩尔当量TsNBr的处理2中K的存在2 CO 3,Ñ,Ñ在适中的产率获得'-ditosyl二胺衍生物。当在室温下在干燥的CH 2 Cl 2中用试剂处理烯烃时,观察到氨基溴的瞬时形成。
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
A bromo-capped diruthenium(<scp>i</scp>,<scp>i</scp>) N-heterocyclic carbene compound for <i>in situ</i> bromine generation with NBS: catalytic olefin aziridination reactions
作者:Gargi Sengupta、Pragati Pandey、Subhabrata De、Ramesh Ramapanicker、Jitendra K. Bera
DOI:10.1039/c8dt01851k
日期:——
at room temperature. Cycloalkene and stilbene are readily brominated by stoichiometric reactions with 1 and NBS. An analysis of the dibrominated products suggests the formation of cyclic bromonium intermediates indicating in situ Br2 generation. Complex 2, an iodide analogue of 1, is also synthesized. The reaction of 2 with N-iodosuccinimide releases I2, which is confirmed by the starch-iodine test