Acidic ionic liquid immobilized on cellulose: an efficient and recyclable heterogeneous catalyst for the solvent-free synthesis of hydroxylated trisubstituted pyridines
作者:Shailesh P. Satasia、Piyush N. Kalaria、Dipak K. Raval
DOI:10.1039/c3ra23052j
日期:——
The synthesis of a novel cellulose supported acidic ionic liquid (Cell-IL) for the solvent-free synthesis of hydroxylated trisubstituted pyridines is reported. Cell-IL was prepared by immobilization of an acidic ionic liquid [1-butyl-3-(3-trimethoxypropyl)-1H-imidazol-3-ium hydrogen sulfate] on cellulose. The viability of this concept has been confirmed by FT-IR, TGA-DTG, 1H NMR and elemental analysis. The Cell-IL showed good thermal stability and exhibited a high catalytic activity in the synthesis of a series of hydroxylated trisubstituted pyridines. It was recovered and reused for the model reaction three times without an appreciable change in its activity.
Application of salicylic acid as an eco‐friendly and efficient catalyst for the synthesis of 2,4,6‐triaryl pyridine, 2‐amino‐3‐cyanopyridine, and polyhydroquinoline derivatives
作者:Majid Roozifar、Nourallah Hazeri、Homayoun Faroughi Niya
DOI:10.1002/jhet.4242
日期:2021.5
In this study, three eco‐friendly, efficient, and convenient protocols have been reported for one‐pot synthesis of 2,4,6‐triaryl pyridine, 2‐amino‐3‐cyanopyridine, and polyhydroquinoline derivatives using salicylic acid as a catalyst under solvent‐free condition. The reported protocols offer several significant advantages such as the application of a nontoxic, neutral, and cheap catalyst, environmentally
Solvent- and catalyst-free synthesis of new hydroxylated trisubstituted pyridines under microwave irradiation
作者:Guodong Yin、Qiong Liu、Junrui Ma、Nengfang She
DOI:10.1039/c2gc35243e
日期:——
A facile solvent- and catalyst-free method for the synthesis of a series of new hydroxylated 2,4,6-trisubstituted pyridinesundermicrowave irradiation was developed. The expected products were obtained through a simplified purification process without protection of the hydroxyl group. UV-Vis and fluorescence spectra of these conjugated multi-hydroxyl compounds were also investigated.