An efficient synthesis of novel spiro[benzo[c]pyrano[3,2-a]phenazines] via domino multi-component reactions using l-proline as a bifunctional organocatalyst
                                
                                    
                                        作者:Alireza Hasaninejad、Somayeh Firoozi、Fatemeh Mandegani                                    
                                    
                                        DOI:10.1016/j.tetlet.2013.03.073
                                    
                                    
                                        日期:2013.5
                                    
                                    A novel, domino, multi-component reaction for the synthesis of polyfunctionalized spiro[benzo[c]pyrano[3,2-a]phenazine] derivatives has been established. L-Proline has been used as a bifunctional catalyst for the one-pot condensation of 2-hydroxy-1,4-naphthoquinone with aromatic 1,2-diamines to form the corresponding quinoxalines and then cyclo-condensation with an allcylmalonate and a cyclic carbonyl compound leads to novel spiro[benzo[c]pyrano[3,2-a]phenazine] derivatives in high yields and short reaction times. (C) 2013 Elsevier Ltd. All rights reserved.