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)-pyrano[4,3-b]pyrans, cis-trans-(2,4:4,7)-pyrano[4,3-b]pyrans, or diastereoisomeric mixtures of pyrano[4,3-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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Pałasz, A., Jelska, K., Ożóg, M. et al. 5-Arylidene Derivatives of Meldrum’s Acid as Synthons in Pyrano[4,3-b]pyran Synthesis. Monatsh. Chem. 138, 481–488 (2007). https://doi.org/10.1007/s00706-007-0622-5
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DOI: https://doi.org/10.1007/s00706-007-0622-5