New synthetic approaches to novel [4,5]-annelated pyridazine derivatives through the closely related intermediates, are described. These include derivatives of two angularly oriented ring systems (4) and (5), as well as those of pyrano[2,3-d]- and pyrazolo[3,4-d]pyridazines (6) and (8). The tertiary amino effect was successfully applied to the construction of the former compounds, whereas the latter compounds were formed by the cyclization based on addition-elimination sequences.
|Number of pages||4|
|Publication status||Published - Jan 1 1994|
ASJC Scopus subject areas
- Analytical Chemistry
- Organic Chemistry