title: The double [3 + 2] photocycloaddition reaction.
abstract: A remarkable double [3 + 2] photocycloaddition reaction that results in the formation of fenestrane 2 from aromatic acetal 1 is reported. During the formation of 2, four carbon-carbon bonds, five new rings, and seven new stereocenters are created in a one-pot process. The reaction occurs in a sequential manner from the linear meta photocycloadduct 3, while the angular meta photocycloadduct 4 undergoes an alternative fragmentation-translocation photoreaction to afford angular tricycle 6.
authors.affiliation: Department of Chemistry and Biochemistry, University of Sussex, Brighton BN1 9QJ, UK. c.s.penkett@sussex.ac.uk
authors.forename: Clive S
authors.initials: CS
authors.lastname: Penkett
authors.forename: Jason A
authors.initials: JA
authors.lastname: Woolford
authors.forename: Iain J
authors.initials: IJ
authors.lastname: Day
authors.forename: Martyn P
authors.initials: MP
authors.lastname: Coles