An unusual direction of the Richter synthesis. 1H-naphtho[2,3-g]indazole-6,11-diones
                                
                                    
                                        作者:Mark S. Shvartsberg、Irena D. Ivanchikova、Lidiya G. Fedenok                                    
                                    
                                        DOI:10.1016/s0040-4039(00)73485-x
                                    
                                    
                                        日期:1994.9
                                    
                                    Diazotization of 2-acetylenic derivatives of 1-aminoanthraquinone followed by intramolecular cyclization leads to the formation is good yields of 1H-3-acyl- or 1H-3-(1,1-dichloroalkyl)naphtho[2,3-g]indazole-6,11-diones, rather than 3-substituted 4-hydroxynahtho[2,3-h]cinnoline-7,1 2-diones, the normal Richter synthesis products.