Novel, efficient synthetic pathways were developed for the synthesis of a variety of pyridazino-fused polycyclic ring systems not easily accessible by other routes. The strategy is based on the sequential or one-pot combinations of a palladium catalyzed C-
We describe tandem combinations of Suzuki-aza-Wittig, Suzuki-condensation and aza-Wittigelectrocyclic ring closure reactions for the synthesis of new pyridazino [4,5-c]
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