Halogenation of Carbonyl Compounds by an Ionic Liquid, [AcMIm]X, and Ceric Ammonium Nitrate (CAN)
作者:Brindaban C. Ranu、Laksmikanta Adak、Subhash Banerjee
DOI:10.1071/ch07061
日期:——
An ionic liquid, acetylmethylimidazolium halide ([AcMIm]X), in combination with ceric ammoniumnitrate promotes halogenations of a wide variety of ketones and 1,3-keto esters at the α-position. The ionic liquid acts here as reagent as well as reaction medium, and thus the reaction does not require any organic solvent or conventional halogenating agent. The reaction is completely arrested when the radical
离子液体乙酰甲基咪唑鎓卤化物 ([AcMIm]X) 与硝酸铈铵结合可促进多种酮和 1,3-酮酯在 α 位的卤化。离子液体在此既充当试剂又充当反应介质,因此该反应不需要任何有机溶剂或常规卤化剂。当使用自由基猝灭剂 TEMPO 时,反应完全停止。还提出了一种似是而非的激进机制。
A quick, mild and efficient bromination using a CFBSA/KBr system
作者:Pan-Pan Jiang、Xian-Jin Yang
DOI:10.1039/c6ra20217a
日期:——
chemistry and brominated compounds as building blocks are of paramount importance in organic synthesis. In our study, we have developed an efficientmethod of bromination by using a CFBSA/KBr system at room temperature in a short reaction time. Notably, this approach has been proven to be applicable to a range of substrates including 1,3-diketones and β-keto esters, phenols, aromatic amines and heteroarenes
Room temperature ionic liquids (ILs) are used as a green recyclable reaction media for the α-monohalogenation of 1,3-diketones, β-keto-esters and cyclic ketones with N-halosuccinimides in excellent yields in the absence of a catalyst. The recovered ionic liquid was reused five to six times with consistent activity.
Amberlyst-15®-promoted efficient 2-halogenation of 1,3-keto-esters and cyclic ketones using N-halosuccinimides
作者:H.M. Meshram、P.N. Reddy、K. Sadashiv、J.S. Yadav
DOI:10.1016/j.tetlet.2004.11.140
日期:2005.1
A simple and rigid process has been developed for the alpha-monohalogenation of 1,3-keto-esters with N-halosuccinimides catalyzed by Amberlyst-15((R)) at room temperature to produce the corresponding 2-halo 1,3-keto-esters in high yields. This protocol also extended to alpha-halogenation of cyclic ketones. (C) 2004 Elsevier Ltd. All rights reserved.
Visible‐Light‐Mediated Stereoselective 1,2‐Iodoalkylation of Alkynes
作者:Jie‐Jie Liu、Ling Lan、Yu‐Ting Gao、Qi Liu、Liang Cheng、Dong Wang、Li Liu
DOI:10.1002/adsc.201801636
日期:2019.3.15
visible‐light‐mediated and photocatalyst/initiator‐free addition to alkynes has been developed. An atom transfer radical addition (ATRA) mechanistic afforded a broad scope of valuable iodo‐substituted alkenyl derivatives with high E/Z‐selectivities, which are versatile intermediates for the synthesis of various tri‐ and tetra‐ substituted alkenes.