Synthesis of Naphthocyclobutenes from α-Naphthyl Acrylates by Visible-Light Energy-Transfer Catalysis
作者:Theodor Peez、Veronika Schmalz、Klaus Harms、Ulrich Koert
DOI:10.1021/acs.orglett.9b01585
日期:2019.6.7
Methyl (alpha-naphthyl) acrylates bearing an ortho-substituent with a hydrogen atom produce naphthocy-clobutenes upon Ir(Fppy)(3)-mediated photosensitization. This reaction can be described as a carbon analogue of the Norrish-Yang reaction: upon triplet excitation of the acrylate a 1,5-HAT results in a 1,4-diradical which forms the cyclobutene. Diastereoselectivities up to >20:1 were observed for the ring-closure reaction.