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Beilstein J. Org. Chem. 2014, 10, 1834–1839, doi:10.3762/bjoc.10.193
Graphical Abstract
Scheme 1: Synthesis of the macrocyclic bis(ureas) 1 and 2.
Scheme 2: Formation of dihydroindoloquinolinone 3 from 1 by vacuum sublimation.
Figure 1: The molecular structure of 2·2DMF in two different views, on top perpendicular to the plane, on bot...
Figure 2: Molecular structure of the anionic complex in NEt4[Br·2]. Two different representations are given, ...
Figure 3: 1H NMR spectra of 2 in THF-d8 after addition of several different tetrabutylammonium salts. The N−H...
Figure 4: 1H NMR spectra of 2 in THF-d8 after addition of increasing molar equivalents of tetrabutylammonium ...