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.
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.