Novel Anionic Annelation Tactics for Construction of Fused Heteroaromatic Frameworks. 1. Synthesis of 4-Substituted Pyrazolo[4,3-<i>c</i>]quinolines, 9-Substituted Pyrazolo[3,4-<i>c</i>]quinolines, and 1,4-Dihydrochromeno[4,3-<i>c</i>]pyrazoles
                                
                                    
                                        作者:Jan Pawlas、Per Vedsø、Palle Jakobsen、Per Olaf Huusfeldt、Mikael Begtrup                                    
                                    
                                        DOI:10.1021/jo001422u
                                    
                                    
                                        日期:2001.6.1
                                    
                                    4-Substituted pyrazolo[4,3-c]quinolines 4a-i and 6a-b were prepared from pyrazole 3 whereas 9-substituted pyrazolo[3,4-c]quinolines 9a-d and 17 were prepared from pyrazole 13 utilizing anionic annelation techniques. 1,4-dihydrochromeno[4,3-c]pyrazoles 7a-c were accessed from pyrazole 3, extending the method for the synthesis of 4a-i.
                                    由
吡唑3制备4-取代的
吡唑并[4,3-c]
喹啉4a-i和6a-b,而9-8取代
吡唑并[3,4-c]
喹啉9a-d和17由
吡唑13利用阴离子去离子化制备。技术。从
吡唑3中获得1,4-二氢色素[4,3-c]
吡唑7a-c,扩展了4a-i的合成方法。