2-Allyl-N-benzyl substituted α-naphthylamines as building blocks in heterocyclic synthesis. New and efficient syntheses of benz[e]naphtho[1,2-b]azepine and naphtho[1,2-b]azepine derivatives

A new series of 13-acetyl-7,12-dihydro-7-ethylbenz[e]naphtho[1,2-b]azepine (4a–d) and 2-aryl-4-hydroxy-2,3,4,5-tetrahydronaphtho[1,2-b]azepine derivatives (6a–d) have been synthesized from N-allyl-N-benzyl substituted α-naphthylamines (1a–d) by utilizing aromatic amino-Claisen rearrangement, intramolecular Friedel–Crafts alkylation and intramolecular dipolar 1,3-cycloaddition nitrone-olefin reactions.