Photodehydrocyclizations in stilbene-like compounds. X. Rearrangements in the photocyclization of 4,5-diphenyltriphenylene and 4,5-diphenylphenanthrene
Alkynes as Linchpins for the Additive Annulation of Biphenyls: Convergent Construction of Functionalized Fused Helicenes
作者:Rana K. Mohamed、Sayantan Mondal、Joseph V. Guerrera、Teresa M. Eaton、Thomas E. Albrecht‐Schmitt、Michael Shatruk、Igor V. Alabugin
DOI:10.1002/anie.201606330
日期:2016.9.19
A new approach to fused helicenes is reported, where varied substituents are readily incorporated in the extended aromatic frame. From the alkynyl precursor, the final helical compounds are obtained under mild conditions in a two‐step process, in which the final C−C bond is formed via a photochemical cyclization/ dehydroiodination sequence. The distortion of the π‐system from planarity leads to unusual