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.