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.
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.