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Synthesis 2003(5): 0673-0676
DOI: 10.1055/s-2003-38066
DOI: 10.1055/s-2003-38066
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York
Synthesis of 1H-2-Benzopyran-5,8-dione Derivatives from 2-(1-Hydroxyalkyl)-1,4-benzoquinones and Enamines
Further Information
Received
28 November 2002
Publication Date:
21 March 2003 (online)
Publication History
Publication Date:
21 March 2003 (online)
Abstract
An efficient synthesis of the title benzopyranodione derivatives based on a Michael addition/cyclization sequence between 2-(1-hydroxyalkyl)-1,4-benzoquinones and enamines (or an imine) is described.
Key words
enamines - heterocycles - benzoquinones
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The reaction in toluene proceeded sluggishly and gave a lower yield of the expected product.