Mechanistic Studies on a New Catalyst System (CuI-NaHSO4×SiO2) Leading to the One-Pot Synthesis of Imidazo[1,2-a]pyridines from Reactions of 2-Aminopyridines, Aldehydes, and Terminal Alkynes
作者:Rina Ghosh、Sarita Mishra
DOI:10.1055/s-0030-1260255
日期:2011.11
One-pot reactions of aldehydes, 2-aminopyridines, and terminal alkynes, in the presence of the copper(I) iodide-NaHSO4˙SiO2 combination catalyst in refluxing toluene, generate the corresponding imidazo[1,2-a]pyridines in high to excellent yields; the mechanism has been studied. CuI-NaHSO4˙SiO2 - one-pot synthesis - imidazo[1,2-a]pyridine - 2-aminopyridine - cascade reaction
As a cellular bile acid sensor, farnesoid X receptor (FXR) participates in regulation of bile acid, lipid and glucose homeostasis, and liver protection. Clinical results have validated FXR as therapeutic target in hepatic and metabolic diseases. To date, potent FXR agonists share a negatively ionizable function that might compromise their pharmacokinetic distribution and behavior. Here we report the development and characterization of a high-affinity FXR modulator not comprising an acidic residue.