The Baylis—Hillman Acetates in Organic Synthesis: Unprecedented Sodium Nitrite Induced Intramolecular Friedel—Crafts Cyclization of Secondary Nitro Compounds.

Unprecedented sodium nitrite mediated intramolecular Friedel–Crafts cyclization of alkyl (E)-2-arylidene-4-nitroalkanoates and (E)-3-arylidene-5-nitroalkan-2-ones derived from Baylis–Hillman acetates, providing a facile protocol for synthesis of naphthalenes, phenanthrenes, and carbazoles has been described.