Photosensitised regioselective [2+2]-cycloaddition of cinnamates and related alkenes
作者:Santosh K. Pagire、Asik Hossain、Lukas Traub、Sabine Kerres、Oliver Reiser
DOI:10.1039/c7cc06710k
日期:——
An efficient method for the synthesis of substituted cyclobutanes from cinnamates, chalcones, and styrenes has been developed utilizing a visible-light triplet sensitisation mode. This reaction provides a diverse range of substituted cyclobutanes in high yields under mild conditions without the need of external additives. Good regioselectivity is obtained due to strong π–π-stacking of arene moieties
Organophotocatalytic [2+2] Cycloaddition of Electron‐Deficient Styrenes**
作者:Maxim Golfmann、Louis Glagow、Antonios Giakoumidakis、Christopher Golz、Johannes C. L. Walker
DOI:10.1002/chem.202202373
日期:2023.1.12
The [2+2] cycloaddition of alkenes is a powerful method of preparing cyclobutanes, but the use of electron-deficient styrenes has been largely neglected so far. By using the organophotocatalyst 4CzIPN, a visible-light-mediated procedure to cyclobutane motifs bearing electron-deficient aryl substituents has been developed. Homodimerisations as well as intramolecular reactions to fused bicyclic motifs