Photocycloaddition Reactions of 2-(Alk-3-en-1-ynyl)cyclohex-2-enones
作者:Janne Möbius、Paul Margaretha
DOI:10.1002/hlca.200890240
日期:2008.12
The newly synthesized 2-(alk-3-en-1-ynyl)cyclohex-2-enones 4 undergo photodimerization (chemo- and regio-)selectively at the exocyclic CC bond to give diastereoisomeric mixtures of 1,2-dialkynyl-1,2-dimethylcyclobutanes. On irradiation of 4 in the presence of 2-chloroacrylonitrile, cyclobutane formation occurs again (chemo- and regio-)selectively at the exocyclic CC bond to afford diastereoisomeric