Synthesis 2001(8): 1143-1148
DOI: 10.1055/s-2001-15058
PAPER
© Georg Thieme Verlag Stuttgart · New York

Regioselectivity of the Intramolecular Photocycloaddition of α,β-Butenolides to a Terminal Alkene

Félix Busquéa, Pedro de Marcha, Marta Figueredo*a, Josep Font*a, Paul Margarethab, Javier Rayaa
a Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
b Institut für Organische Chemie, Universität Hamburg, 20146 Hamburg, Germany
Fax: +34(93)5811265; e-Mail: marta.figueredo@uab.es; josep.font@uab.es;
Further Information

Publication History

Received 1 February 2001
Publication Date:
24 September 2004 (online)

Abstract

The intramolecular [2+2] photocycloaddition of α,β-butenolides to a terminal double bond tethered to the lactone through the γ-position and located at a suitable distance has been studied. The regioselectivity of the photoisomerization depends on the substitution pattern of the substrate and can be rationalized by simple theoretical calculations performed on the diradical intermediates.