Diastereo- and Enantioselective Intramolecular [2+2] Photocycloaddition Reactions of 3-(ω′-Alkenyl)- and 3-(ω′-Alkenyloxy)-Substituted 5,6-Dihydro-1<i>H</i>-pyridin-2-ones
作者:Dominik Albrecht、Florian Vogt、Thorsten Bach
DOI:10.1002/chem.200902616
日期:2010.4.12
37 % overall yield from 3‐diazopiperidin‐2‐one (15) by an α,α‐chloroselenylation reaction at the 3‐position followed by nucleophilic displacement of a chloride ion with an ω‐alkenolate and oxidative elimination of selenoxide. Upon irradiation at λ=254 nm, the precursor compounds underwent a clean intramolecular [2+2] photocycloadditionreaction. Substrates 2 and 5, tethered by a two‐atom chain, exclusively