Abstract
The site-selectivity and regioselectivity of Diels–Alder reactions of allenyl aryl ethers with cyclopentadiene and acrolein were studied. While cyclopentadiene (as an electron-rich diene) only reacted with the external double bond of allenyl aryl ethers to provide the site-selective normal electron demand Diels–Alder cycloadducts, acrolein (as an electron-deficient diene) reacted with the C1–C2 π bond of allenyl aryl ethers to provide the site- and regioselective hetero-Diels–Alder cycloadducts as exclusive products.
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Acknowledgments
We are grateful to Dr. S. Taheri and Miss Z. Karimnia for recording NMR spectra. Also, we would like to acknowledge the Islamic Development Bank (IDB) for granting a loan in 1993 for purchasing a 500 MHz Bruker NMR spectrometer.
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Moghaddam, F.M., Kiamehr, M. Site-selective and regioselective Diels–Alder reaction of allenyl aryl ethers. Monatsh Chem 141, 1333–1337 (2010). https://doi.org/10.1007/s00706-010-0406-1
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DOI: https://doi.org/10.1007/s00706-010-0406-1