5-Arylidene Derivatives of <Emphasis Type="Italic">Meldrum</Emphasis>’s Acid as Synthons in Pyrano[4,3-<Emphasis Type="Italic">b</Emphasis>]pyran Synthesis |
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Authors: | Aleksandra Pa?asz Katarzyna Jelska Monika O?óg Pawe? Serda |
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Institution: | (1) Department of Organic Chemistry, Jagiellonian University, Kraków, Poland;(2) Regional Laboratory, Jagiellonian University, Kraków, Poland |
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Abstract: | Summary. The reactions of 5-arylidene derivatives of Meldrum’s acid with ethyl vinyl ether or N-vinyl-2-oxazolidinone yielded trans-trans-(2,4:4,7)-pyrano4,3-b]pyrans, cis-trans-(2,4:4,7)-pyrano4,3-b]pyrans, or diastereoisomeric mixtures of pyrano4,3-b]pyrans and reactions with 3,4-dihydro-2H-pyran afforded Michael adducts. The reactions of 5-arylidene derivatives of Meldrum’s acid with cyanoacetic acid derivatives do not provide appropriate pyrans. |
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Keywords: | , Pyrans, α,,β,-Unsaturated ketone, Enol ethers, Michael addition, |
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