and dicarbonyl compounds
Pyrimidines can be made from
1,3-dicarbonyl compounds and amidine
Unsymmetrical nucleophiles lead to
selectivity questions
Isoxazoles are made from hydroxylamin}
or by 1,3-Bipolar cycloadditions
Tetrazoles are also made by 1,3-Bipolar
cycloadditions
The Fischer indole synthesis
Quinolines and isoquinolines
More heteroatoms in fused rings mean
more choice in synthesis