ChemInform Abstract: Facile Synthesis of N‐Acylsulfonamide in the Presence of Silica Chloride (SiO₂—Cl) Both under Heterogeneous and Solvent‐Free Conditions.

Abstract

Sulfonamides Q 0560Facile Synthesis of N-Acylsulfonamide in the Presence of Silica Chloride (SiO 2 -Cl) Both under Heterogeneous and Solvent-Free Conditions. -Simple methods for the effective N-acylation of sulfonamides using carboxylic acid anhydrides or chlorides are developed. The solvent-free N-acylation, that proceeds somewhat faster than the corresponding reaction in solution, is a green approach to the preparation of N-acylsulfonamides (III). -(MASSAH*, A. R.; MOMENI, A. R.; DABAGH, M.; ALIYAN, H.; NAGHASH, H. J.; Synth. Commun. 38 (2008) 2, 265-273; Dep. Chem., Shahreza Islamic Azad Univ., Isfahan 86145, Iran; Eng.) -H. Toeppel 25-092

ZSM-5-SO3H as a novel, efficient, and reusable catalyst for the chemoselective synthesis and deprotection of 1,1-diacetates under eco-friendly conditions

“…Some of the solid supported acids, e.g., SiO 2 -OSO 3 H [29] and HClO 4 -SiO 2 [42], are utilized as catalysts for the preparation of 1,1-diacetate derivatives from the corresponding aldehydes. Recently, we have demonstrated the applicability of SiO 2 -OSO 3 H [43], H 3 PO 4 /TiO 2 -ZrO 2 [44,45], H 3 PO 4 /ZSM-5 [46], SiO 2 -OPO 3 H [47], and SiO 2 -Cl [48] as solid supported acids in several organic transformations.…”