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Synlett 2005(10): 1601-1605
DOI: 10.1055/s-2005-869857
DOI: 10.1055/s-2005-869857
LETTER
© Georg Thieme Verlag Stuttgart · New York
Ring Selectivity in the Na/EtOH Reduction of 1-Aryl-7-methoxynaphthalenes
Further Information
Received
20 April 2005
Publication Date:
07 June 2005 (online)
Publication History
Publication Date:
07 June 2005 (online)

Abstract
Na/EtOH reduction of 1-aryl-7-methoxynaphthalenes occurred preferentially at the A-ring when no substituents were present at the ortho-positions of the aryl group (up to 100% selectivity), to afford 1-aryl-7-methoxy-1,2,3,4-tetrahydronaphthalenes. Ortho-substitution of the 1-aryl moiety favored B-ring reduction (up to 85:15 selectivity) giving rise, after acidic hydrolysis of the vinyl ether intermediate, to the corresponding 8-aryl-2-tetralones.
Key words
biaryls - chemoselectivity - steric hindrance - reductions - sodium
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