New Approach to 4-Phenyl-β-aminotetralin from 4-(3-Halophenyl)tetralen-2-ol Phenylacetate

Tetrahedron Lett. 2009 Sep 9;50(36):5107-5109. doi: 10.1016/j.tetlet.2009.06.099.

Abstract

Mixed trifluoroacetyl phenylacetyl anhydride and 3-halostyrenes (fluoro, chloro, and bromo) or vinylcycloalkanes (cyclohexyl, cyclooctyl), undergo cascade Friedel-Crafts cycli-acylalkylation, enolization, and O-acylation to give 4-substituted tetralen-2-ol phenylacetates, without additional solvent in good yields. Base alcoholysis of 4-phenyltetralen-2-ol phenylacetate reveals the tetral-2-one for asymmetric transfer hydrogenation. Bromophenyltetralen-2-ol phenylacetate undergoes Suzuki coupling, and provides a short route to trans-4-phenyl-β-aminotetralin.