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Synthesis 2003(13): 2047-2052
DOI: 10.1055/s-2003-41019
DOI: 10.1055/s-2003-41019
PAPER
© Georg Thieme Verlag Stuttgart · New York
Carbonylation of Doubly Lithiated N′-Aryl-N,N-Dimethylureas: A Novel Approach to Isatins via Intramolecular Trapping of Acyllithiums
Further Information
Received
28 May 2003
Publication Date:
19 August 2003 (online)
Publication History
Publication Date:
19 August 2003 (online)
Abstract
Lithiation of N′-(2-bromoaryl)-N,N-dimethylureas with methyllithium and tert-butyllithium under nitrogen in anhydrous THF at 0 °C gave doubly lithiated arylurea derivatives, which react with carbon monoxide at 0 °C to give isatins in good yields. The scope of the reaction has been demonstrated by application to the synthesis of isatin itself and four substituted isatins bearing alkyl, chloro or fluoro groups.
Key words
carbonylation - N,N-dimethylureas - isatins - intramolecular trapping - positron emission tomography
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References
Permanent address: G. A. El-Hiti, Department of Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt.
9Smith, K.; El-Hiti, G. A.; Abdel-Megeed, M. F. Russ. J. Org. Chem. 2003, accepted for publication.