β-Nitroacrylates as Useful Building Blocks for the Synthesis of Alkyl Indole-2-Carboxylates
摘要:
Polyfunctionalized alkyl indole 2-carboxylates can be easily synthesized starting form -nitroacrylates and o-bromoanilines through an addition-elimination process followed by an intramolecular palladium-catalyzed Heck reaction.
The reaction of β‐nitroacrylates with pyrroles, under solvent‐ and catalyst‐free conditions, allows the formation of Friedel–Crafts adducts which, after in situ treatment with Amberlyst 15 in isopropyl alcohol under reflux, provide polysubstitutedindoles, via a benzannulation reaction, in a one‐pot process.