Hexafluoroisopropanol‐Promoted or Brønsted Acid‐Mediated Photochemical [2+2] Cycloadditions of Alkynes with Maleimides
作者:Ierasia Triandafillidi、Nikolaos F. Nikitas、Petros L. Gkizis、Nikoleta Spiliopoulou、Christoforos G. Kokotos
DOI:10.1002/cssc.202102441
日期:2022.2.18
Photochemistry: A systematic study for the development of a mild, metal-free, and easy-to-execute protocol for the photochemical [2+2] cycloaddition of alkynes with maleimides is presented.
Organocatalyzed Synthesis of Highly Functionalized Phthalimides via Diels–Alder Reaction Employing Two Dienophiles
作者:Muhammad Saeed Akhtar、Yong Rok Lee
DOI:10.1021/acs.joc.0c01991
日期:2020.12.4
An efficient and facile protocol for the synthesis of biologically and pharmaceutically important phthalimides is developed by l-proline-catalyzed reaction between two dienophiles of α,β-unsaturated aldehydes and maleimides. The reaction involves an efficient benzannulation that proceeds via a formal [4 + 2] cycloaddition of azadiene intermediates generated in situ from enals and N-substituted maleimides