Synlett 2005(10): 1601-1605  
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

M. Carmen Carreño*, Marcos González-López, Alfonso Latorre, Antonio Urbano*
Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, Cantoblanco, 28049-Madrid, Spain
Fax: 34(91)4973966; e-Mail: carmen.carrenno@uam.es; e-Mail: antonio.urbano@uam.es;
Further Information

Publication History

Received 20 April 2005
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.