An Efficient Method for the Synthesis of Novel N-acylsulfonamides Using Tin (IV) Chloride as Catalysts
摘要:
A series of novel N-acylsulfonamides derivatives were synthesized via direct condensation of parent sulfonamide with ethyl lactate as an acylating agent in the presence of tin (IV) chloride (SnCl4) as a Lewis acid catalyst. The sulfonamides were prepared, starting from chlorosulfonyl isocyanate (CSI), in three steps (carbamoylation, sulfamoylation, and deprotection) with excellent yields.
Simple, rapid, and clean condensation of sulfonamide and maleic anhydride derivatives: Synthesis of novel 1<i>H</i>- Pyrrole-2,5-diones under heterogeneous conditions
GRAPHICAL ABSTRACT ABSTRACT H6P2W18O62 is used as an efficient catalyst for the synthesis of novel N-substituted sulfonyl maleimides (1H-Pyrrole-2,5-diones) via the condensation of sulfonamide and maleic anhydride derivatives. The Dawson heteropolyacid was used with a catalytic amount of 2 mmol% in acetonitrile at reflux. The reuse of H6P2W18O62 as heterogeneous catalyst several times without decrease
Abstract The present study describes a convenient method for the synthesis of new N-acylsulfonamides containing phosphonate moiety. The N-acylsulfonamides were prepared starting from chlorosulfonyl isocyanate (CSI) in four steps (carbamoylation, sulfamoylation, deprotection, and acylation). Trimethylphosphite has been used to introduce the phosphonate moiety into N-acylsulfonamides via Arbuzov reaction
The synthesis of new series of pyrrolidine-2,5-diones having sulfonamide moieties is described. These compounds are synthesized in good yield in three steps (carbamoylation-sulfamoylation, deprotection and condensation) using a catalytic amount of H6P2W18O62 in acetonitrile under refluxing conditions.
Synthesis and antibacterial activity of sulfonamides. SAR and DFT studies
A series of substituted sulfonamide derivatives were synthesized from chlorosulfonyl isocyanate (CSI) in tree steps (carbamoylation, sulfamoylation and deprotection). Antibacterial activity in vitro of some newly formed compounds investigated against clinical strains Gram-positive and Gram-negative: Escherichia coli and Staphylococcus aureus applying the method of dilution and minimal inhibition concentration (MIC) methods. These compounds have significant bacteriostatic activity with totalities of bacterial strains used. OFT calculations with B3LYP/6-31G(d) level have been used to analyze the electronic and geometric characteristics deduced for the stable structure of three compounds presenting conjugation between a nitrogen atom N through its lone pair and an aromatic ring next to it. The principal quantum chemical descriptors have been correlated with the antibacterial activity. (C) 2014 Elsevier B.V. All rights reserved.