A mild and environmentally acceptable synthetic protocol for chemoselective α-bromination of β-keto esters and 1,3-diketones
作者:Abu T. Khan、Papori Goswami、Lokman H. Choudhury
DOI:10.1016/j.tetlet.2006.02.075
日期:2006.4
A wide variety of unsubstituted β-ketoesters can be brominated chemoselectively to the corresponding α-monobromo-β-keto esters by using a combination of vanadium pentoxide, hydrogen peroxide and ammonium bromide in a biphasic system, dichloromethane–water at 0–5 °C. In addition, α-mono substituted β-ketoesters, cyclic β-keto-esters and 1,3-diketones can also be brominated selectively using the same
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.
Route exploration and synthesis of the reported pyridone-based PDI inhibitor STK076545
作者:Eric Greve、Sergey V. Lindeman、Christina Scartelli、Lin Lin、Robert Flaumenhaft、Chris Dockendorff
DOI:10.1039/d0ob01205j
日期:——
confirm its activity and support further biological studies, a resynthesis was pursued of the reported β-keto-amide with an N-alkylated pyridone at the α-position. Numerous conventional approaches were complicated by undesired fragmentations or rearrangements. However, a successful 5-step synthetic route was achieved using an aldol reaction with an α-pyridone allyl ester as a key step. An X-ray crystal