sulfonamides with carboxylic acid anhydrides in the presence of Lewisacids is described. Several Lewisacids such as BF3·Et2O, ZnCl2, MoCl5, TiCl4, B(C6F5)3, Sc(OTf)3 and I2 were found to catalyze the reactionefficiently to furnish the N-acylated products in good yields undersolvent-freeconditions. The reactions of various sulfonamides were studied with different carboxylic acid anhydrides including the
Sulfonimidation via ring-opening of 2-oxazolines with acidic sulfonimide nucleophiles
作者:David A. Gutierrez、Dayton R. Dean、Candace M. Laxamana、Madyson Migliozzi-Smith、Connor J. O’Brien、Claire L. O’Neill、Jie Jack Li
DOI:10.3998/ark.5550190.p009.609
日期:——
Acidicsulfonimidenucleophiles including dibenzene sulfonimide, o-benzenesulfonimide, dimethanesulfonimide, and N-(methylsulfonyl)-benzenesulfonamide are discovered to open a variety of alkyl-, aryland heteroaryl-2-oxazoline rings to provide the sulfonimidation products in refluxing 1,4-dioxane. The electron-rich 2-oxazo line substrates worked well for the nucleophilic ring-opening reactions while
Fe-exchanged montmorillonite K10––the first heterogeneous catalyst for acylation of sulfonamides with carboxylic acid anhydrides
作者:Devendrapratap U Singh、Pankajkumar R Singh、Shriniwas D Samant
DOI:10.1016/j.tetlet.2004.04.077
日期:2004.6
Fe-exchanged montmorillonite K10 catalyzes a highly efficient reaction between sterically and electronically diverse sulfonamides and carboxylic acid anhydrides to furnish N-acylsulfonamides in excellent yield and high selectivity. The catalyst can also be reused several times. (C) 2004 Elsevier Ltd. All rights reserved.