An easy access to tetralin and indane skeletons has been developed using a diastereoselective intramolecular Friedel-Crafts alkylation. Treatment of diastereomeric mixtures of benzyl carbinols with a catalytic amount of Ca(NTf2)(2)/Bu4NPF6 yields the respective tetralin or indane in good yields with high levels of regio- and diastereoselectivity.
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