Copper-Free Palladium-Catalyzed Sonogashira Coupling−Annulation: Efficient One-Pot Synthesis of Functionalized Pyrano[4,3- b ]quinolines from 2-Chloro-3-formylquinolines
✍ Scribed by Chandra, Atish; Singh, Bhawana; Khanna, Ranjana S.; Singh, Radhey M.
- Book ID
- 120315428
- Publisher
- American Chemical Society
- Year
- 2009
- Tongue
- English
- Weight
- 673 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0022-3263
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## Abstract Several 4‐azaphthalides (=furo[3,4‐__b__]pyridin‐5(7__H__)‐ones) and 5‐azaisocoumarins (=5__H__‐pyrano[4,3‐__b__]pyridin‐5‐ones) were prepared through a tandem heterogeneous Pd/C‐mediated __Sonogashira__ coupling and a 5‐__exo‐dig__ or 6‐__endo‐dig__ intramolecular cyclization of 2‐brom