Room-temperature synthesis of pyrazoles, diazepines, β-enaminones, and β-enamino esters using silica-supported sulfuric acid as a reusable catalyst under solvent- …

…, J She, ZC Shang, J Wu, P Zhang

Index: Chen, Xiang; She, Jin; Shang, Zhi-Cai; Wu, Jun; Zhang, Peizhi Synthetic Communications, 2009 , vol. 39, # 6 p. 947 - 957

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Citation Number: 42

Abstract

Abstract Silica-supported sulfuric acid (H2SO4· SiO2) has been utilized as a heterogeneous recyclable catalyst for a highly efficient regio-and chemoselective condensation of hydrazines/hydrazides, diamines, and primary amines with various β-dicarbonyl compounds at room temperature to afford pyrazoles, diazepines, and β-enaminones/β-enamino esters under solvent-free conditions within 5–15 min.