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.
The α-position of active methylene compounds which were activated by the carbonyl group was halogenated using metal halides in the presence of peroxides.
Rapid and Catalyst‐Free α‐Halogenation of Ketones using<i>N</i>‐Halosuccinamides in DMSO
作者:B. Sreedhar、P. Surendra Reddy、M. Madhavi
DOI:10.1080/00397910701574908
日期:2007.12
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.