title: [2+2] cycloaddition of 1,3-dienes by visible light photocatalysis.
abstract: [2+2] photocycloadditions of 1,3-dienes represent a powerful yet synthetically underutilized class of reactions. We report that visible light absorbing transition metal complexes enable the [2+2] cycloaddition of a diverse range of 1,3-dienes. The ability to use long-wavelength visible light is attractive because these reaction conditions tolerate the presence of sensitive functional groups that might be readily decomposed by the high-energy UVC radiation required for direct photoexcitation of 1,3-dienes. The resulting vinylcyclobutane products are poised for a variety of further diversification reactions, and this method is consequently expected to be powerfully enabling in the synthesis of complex organic targets.
authors.affiliation: Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706 (USA) http://yoon.chem.wisc.edu.
authors.forename: Anna E
authors.initials: AE
authors.lastname: Hurtley
authors.forename: Zhan
authors.initials: Z
authors.lastname: Lu
authors.forename: Tehshik P
authors.initials: TP
authors.lastname: Yoon
mesh_terms: D002384:Catalysis; D061565:Cycloaddition Reaction; D008027:Light; D055668:Photochemical Processes
keywords: cycloadditions; energy transfer; photochemistry; small ring systems; total synthesis