Synthesis of 1-Hydroxy-Substituted Pyrazolo[3,4-<i>c</i>]- and Pyrazolo[4,3-<i>c</i>]quinolines and -isoquinolines from 4- and 5-Aryl-Substituted 1-Benzyloxypyrazoles
作者:Jan Pawlas、Per Vedsø、Palle Jakobsen、Per Olaf Huusfeldt、Mikael Begtrup
DOI:10.1021/jo000986v
日期:2000.12.1
1-Hydroxypyrazolo[3,4-c]quinoline (22), 1-hydroxypyrazolo[4, 3-c]quinoline (21), 1-hydroxypyrazolo[3,4-c]isoquinoline (20), and 1-hydroxypyrazolo[4,3-c]isoquinoline (19) were prepared from 1-benzyloxypyrazole (6), establishing the pyridine B-ring in the terminal step. The pyridine ring of pyrazoloquinolines 14 and 18 was formed via cyclization of a formyl group at C-4 or C-5 and an amino group of a