Synthesis of Unsymmetrical Pyrrolo[3,2-b]pyrrole-2,5-diones. -Unsymmetrically disubstituted oxalic acid-bis(imidoyl) dichlorides such as (IV) are prepared for the first time. They are used in a one-pot synthesis of pyrrolopyrroles (VI). Additionally, the synthesis of a 2,2'-bisquinazolinone (VIII) is demonstrated. -(LANGER*, P.; HELMHOLZ, F.; SCHROEDER, R.; Synlett 2003, 15, 2389-2391; Inst. Chem.
Synthesis of Unsymmetrical Pyrrolo[3,2-b]pyrrole-2,5-diones S y n t h e s i s o f U n s y m m e t r i c a l P y r r o l o [ 3 , 2 -b ] p y r r o l e -2 , 5 -d i o n e s Abstract: The first unsymmetrical oxalic acid-bis(imidoyl)dichlorides were prepared and applied to the one-pot synthesis of the first unsymmetrical pyrrolo[3,2-b]pyrrole-2,5-diones and 2,2¢-bisquinazolin-4-ones.
Die präparative anodische Oxydation von Papaverin [6,7‐Dimethoxy‐1‐(3,4‐dimethoxy‐benzyl)isochinolin] in Methanol an Platinanoden führt unter Verlust von 3 Wasserstoffatomen pro Mol zu 12,12′‐Bis{2,3,9,10‐tetramethoxy‐indolo[2,1‐a]isochinolinyl}. Hierbei lagert sich die Benzyl‐isochinolinstruktur unter Abgabe von 2 H‐Atomen zu 2,3,9,10‐Tetramethoxy‐indolo[2,1‐a]isochinolin um, das durch weiteren Verlust je eines Protons und Elektrons am C‐Atom 12 dimerisiert. Es wird über voltammetrische Ergebnisse berichtet. 13C‐NMR‐spektroskopische Messungen weisen auf eine beträchtliche Verdrillung beider Molekülhälften hin.
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