An Unusual Pathway to Cyclobutane Formation via Desulfurative Intramolecular Photocycloaddition of an Enone Benzothiazoline Pair
作者:Hyunil Jo、Mark E. Fitzgerald、Jeffrey D. Winkler
DOI:10.1021/ol900186y
日期:2009.4.16
Irradiation of the enone benzothiazoline 3 leads to the formation of cyclobutane 5. Preliminary mechanistic studies establish the intermediacy of an enecarbamate 14 in this photochemical transformation, which could be the result of sulfur extrusion from an episulfide intermediate. Photocycloaddition of the enecarbamate intermediate 14 leads to the formation of “crossed” photoadducts, i.e., 5, in excellent