Ionic Liquid Driven Nucleophilic Substitution of Squaric Acid to Squaramides
作者:Peera Acharasatian、Siraporn Soonthonhut
DOI:10.1055/a-1795-8322
日期:2022.9
crucial encumbrance for the synthesis of squaramides through nucleophilic substitution of squaric acid. The reactions must be performed in an aqueous medium since squaric acid is insoluble in virtually all organic solvents. The scope of amine nucleophiles was consequently restricted to those amines soluble in water. Owing to remarkable solvating ability of ionicliquid, reactions of squaric acid with
Light-Driven Photoconversion of Squaramides with Implications in Anion Transport
作者:Manel Vega、Luis Martínez-Crespo、Miguel Barceló-Oliver、Carmen Rotger、Antonio Costa
DOI:10.1021/acs.orglett.3c00993
日期:2023.5.19
Simple, clean and fast photoconversion of aniline-derived squaramides was achieved by flashlight illumination. UV irradiation enabled the photochemical squaramide ring-opening to generate 1,2-bisketenes, which DMSO trapped as the nucleophilic oxidant. The only photoproducts isolated were 3,4-arylamino maleic anhydrides, which present conformational preferences very different from those of their parent