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Synthesis 2003(2): 0227-0232
DOI: 10.1055/s-2003-36827
DOI: 10.1055/s-2003-36827
PAPER
© Georg Thieme Verlag Stuttgart · New York
Synthesis of Functionalized 4H-Pyran and Cyclohexanone Derivatives via Three-Component Reactions of Dimethyl Acetonedicarboxylate, Aromatic Aldehydes, and Malononitrile
Further Information
Received
30 September 2002
Publication Date:
22 January 2003 (online)
Publication History
Publication Date:
22 January 2003 (online)
Abstract
Dependent on the reaction time, the three-component condensation of dimethyl acetonedicarboxylate (1), aromatic aldehydes 2, and malononitrile (3) gives rise to 4H-pyran derivatives 5 after reflux for 15 min. Moreover, using excess of benzaldehyde and prolonged heating for 150 min afforded multifunctional cyclohexanone derivatives 8. Different substitution patterns in the phenyl nucleus of 8 can be achieved by condensation of 4H-pyran derivatives 5 with benzaldehydes 2.
Key words
heterocycles - carbocycles - Michael additions - rearrangements - cyclizations - condensation
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