Efficient one-pot synthetic protocols for iminosugar-bearing imidazo[1,2-a]pyridines from carbohydrates
                                
                                    
                                        作者:Lal Dhar S. Yadav、Chhama Awasthi                                    
                                    
                                        DOI:10.1016/j.carres.2009.11.016
                                    
                                    
                                        日期:2010.1
                                    
                                    This letter describes two unprecedented one-pot high yielding synthetic approaches to imidazo[1,2-a]pyridine scaffolds from carbohydrates. The first approach involves microwave-assisted acid-catalyzed domino reactions of unprotected D-glucose/D-xylose with ammonium acetate and benzoin to afford polyhydroxy iminosugar-bearing tetrahydroimidazo[1,2-a]pyridines. In the second approach, polyhydroxy iminosugar-bearing tetrahydrobenzimidazo[1,2-a]pyridines were synthesized by using unprotected D-glucose/D-xylose and 1,2-diamines in the presence of 10 mol % of oxalic acid under solvent-free microwave irradiation conditions. (C) 2009 Elsevier Ltd. All rights reserved.