Zwitterionic-type molten salt: An efficient mild organocatalyst for synthesis of 2-amidoalkyl and 2-carbamatoalkyl naphthols

A green and convenient approach for the synthesis of 1,10-phenanthrolines via a catalyst- and solvent-free condition

“…A plausible reaction mechanism for the formation of 1,10-phenanthroline derivatives (5) is depicted in Scheme 1 (43). Presumably, the first step is the formation of the Knoevenagel product (A) generated from 8-hydroxyquinoline (1) …”

Design and characterization of nano-silica-bonded 3-n-propyl-1-sulfonic acid imidazolium chloride {nano-SB-[PSIM]Cl} as a novel, heterogeneous and reusable catalyst for the condensation of arylaldehydes with β-naphthol and alkyl carbamates

“…For example, a-aminoalkyl-b-naphthol derivatives have bradycardiac and hypotensive properties [34,35]. One of the rational synthetic approaches toward a-carbamatoalkyl-b-naphthols is the catalyzed condensation of arylaldehydes with b-naphthol and alkyl carbamates [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50].…”

A convenient three-component synthesis of carbamatoalkyl naphthols catalyzed by cerium ammonium nitrate

“…The reported catalysts include triethylbenzylammonium chloride [3], SiO 2 -NaHSO 4 [4], Brønsted-acidic ionic liquids [5], silica-supported polyphosphoric acid [6], silica-supported Preyssler nano particles [7], SiO 2 -HClO 4 [8], Zwitterionic-type molten salt [9], [MeC(OH) 2 ] + ClO 4 - [10], ionic liquid [NMP] + HSO 4 - [11], sulfamic acid functionalized magnetic nanoparticles [12], Mg(OOCCF 3 ) 2 [13], [Dsim]HSO 4 [14], and [Et 3 N-SO 3 H]Cl [15], etc. However, most of these methods suffer from drawbacks including low yields, expensive reagents and catalysts.…”