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Synthesis 2006(12): 2019-2030
DOI: 10.1055/s-2006-942393
DOI: 10.1055/s-2006-942393
PAPER
© Georg Thieme Verlag Stuttgart · New York
A New Approach to the Synthesis of Highly Substituted 3-Pyrrolin-2-ones
Further Information
Received
19 January 2006
Publication Date:
11 May 2006 (online)
Publication History
Publication Date:
11 May 2006 (online)
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Abstract
The base-promoted cyclization of internal N-propargylmalonamides in the presence of carbonate bases at room temperature or at 80 °C affords highly substituted 3-pyrrolin-2-ones in good yields.
Key words
cyclizations - 3-pyrrolin-2-ones - lactams - propargylamines - palladium
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References
For example, when the amide 3a obtained from the reaction of 1a with ethyl malonyl chloride was reacted with 3-iodo-benzotrifluoride in Et3N-DMF at 50 °C for 5 h, in the presence of PdCl2(PPh3)2, 4aa was obtained in 42% yield.
30PdCl2 (PPh3)2 can be used as catalyst with similar results.
31Carried out using piperidine in place of Et3N, with 0.04 equiv of Cul.