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Novel Anionic Annelation Tactics for Construction of Fused Heteroaromatic Frameworks. 1. Synthesis of 4-Substituted Pyrazolo[4,3-c]quinolines, 9-Substituted Pyrazolo[3,4-c]quinolines, and 1,4-Dihydrochromeno[4,3-c]pyrazoles

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posted on 2001-05-16, 00:00 authored by Jan Pawlas, Per Vedsø, Palle Jakobsen, Per Olaf Huusfeldt, Mikael Begtrup
4-Substituted pyrazolo[4,3-c]quinolines 4ai and 6ab were prepared from pyrazole 3 whereas 9-substituted pyrazolo[3,4-c]quinolines 9ad and 17 were prepared from pyrazole 13 utilizing anionic annelation techniques. 1,4-Dihydrochromeno[4,3-c]pyrazoles 7ac were accessed from pyrazole 3, extending the method for the synthesis of 4ai.