J. Svete, Uroš Grošelj, Jernej Baškovč
Jul 1, 2010
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Influential Citations
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Journal
Zeitschrift für Naturforschung B
Abstract
A library of twelve N(4´)-substituted di-tert-butyl (2S,4E)-4-arylaminomethylidene-5-oxopyrrolidine-1,2-dicarboxylates 6/6´a - l were prepared in 47 - 90% yield by parallel acid-catalysed treatment of di-tert-butyl (2S,4E)-4-[(dimethylamino)methylidene]-5-oxopyrrolidine-1,2-dicarboxylate (4) with anilines 5a - j, ethyl glycinate (5k), and ethyl β -alaninate (3l). Acidolytic deprotection of compounds 6a - c, e - j afforded the corresponding (2S,4E)-4-arylaminomethylidene-5-oxopyrrolidine-2-carboxylic acids 7a - c, e - j in 39 - 99% yield. The configuration around the C=C double bond in the enaminones 6 and 7 was determined by NMR spectroscopy. Graphical Abstract Parallel Solution-phase Synthesis of (2S,4E)-4-(Arylaminomethylidene)pyroglutamic Acids