Cinnolines. VII. The Neber-Bossel Synthesis<sup>1,2</sup>
                                
                                    
                                        作者:Henry E. Baumgarten、Paul L. Creger                                    
                                    
                                        DOI:10.1021/ja01502a047
                                    
                                    
                                        日期:1960.9
                                    
                                    Although the cyclization (if o-hydrazinomandelic acid is known to yield 3-cinnolinol (3-hydroxycinnoline) (the Neber-Bossel synthesis), the cyclization of alpha-substituted o-hydrazinomandelic acids may yield either the corresponding 4-substituted 3-cinnolinol or the 3-substituted 1-aminodioxindole.