One-pot synthesis of various 2-amino-4H-chromene derivatives using a highly active supported ionic liquid catalyst

Abstract

Supported ionic liquid phase catalyst was synthesized and applied for the synthesis of chromene derivatives under solvent-free conditions.

Synthesis and characterization of sodium polyaspartate‐functionalized silica‐coated magnetite nanoparticles: A heterogeneous, reusable and magnetically separable catalyst for the solvent‐free synthesis of 2‐amino‐4H‐chromene derivatives

“…The average crystallite size of the magnetic nanoparticles can be estimated by the (311) XRD peak and Scherrer's formula (D = 0.9λ/ β cos θ ). In this formula, D is defined as the average crystalline size, λ is the X‐ray wave‐length (0.154 nm), β is the full width in radians subtended by the half maximum intensity width of the (311) powder peak, and θ belongs to the Bragg angle of the (311) peak in degrees . According to the data, the crystallite size of the magnetic nanoparticle was obtained 13.3 nm by using Scherrer's equation.…”

“…Recently, catalysts like lipase, Et 3 N, Zn(L‐proline) 2 , p‐toluenesulfonic acid (p‐TSA), iodine, Meglumine, Silica functionalized propyl sulfonic acid, and ionic liquids have been used for the synthesis of chromene derivatives. However, these methods have some disadvantages including long reaction times, harsh reaction conditions and toxic catalysts.…”

Ethylenediamine Functionalized Cellulose Acetate [CAEDA] Nanosized Solid Base Catalyst in the Synthesis of 2‐Amino‐4H‐Chromenes and 5‐Substituted‐1H‐Tetrazoles

“…substituted 2-amino-4H-chromenes. [39][40][41][42][43][44][45][46][47][48][49][50][51][52] Very recent work has been done to synthesize Alkyl-4-(1H-indol-3 yl)-2-alkyl-4H-chromene-3-carboxylates using water extract of lemon [107] and is still in process but many of the protocols suffer from certain drawbacks such as tedious work-up, long reaction time, harsh reaction conditions etc. So, we present here the synthesis of 2amino-4H-chromenes using dimedone, different substituted aromatic aldehydes and malononitrile using ethanol as a solvent at 80°C in presence of Cellulose acetate [1,2-ethylenediamine][CAEDA] as a catalyst (Scheme 1).…”

“…Much research in context to synthesize this biological moiety viz . substituted 2‐amino‐4 H ‐chromenes [39–52] . Very recent work has been done to synthesize Alkyl‐4‐(1 H ‐indol‐3 yl)‐2‐alkyl‐4 H ‐chromene‐3‐carboxylates using water extract of lemon [107] and is still in process but many of the protocols suffer from certain drawbacks such as tedious work‐up, long reaction time, harsh reaction conditions etc.…”

Efficient method for the synthesis of 3-arylbenzoquinoline, pyranoquinoline, and thiopyranoquinoline derivatives using PEG1000-based dicationic acidic ionic liquid as recyclable catalyst via a one-pot multicomponent reaction

“…[18][19][20][21][22][23] In addition, some ILs have been found to be an efficient and recyclable catalysts for the MCRs. [24][25][26][27][28][29][30] To the best of our knowledge, there is no report on the application of PEG 1000 -DAIL as acid catalysts for the preparation of 3-arylbenzoquinoline, pyranoquinoline and thiopyranoquinoline derivatives. This paper forms part of our ongoing interest in ILs [31][32][33][34][35][36][37] and MCRs.…”