Highly regioselective hetero-Diels–Alder reactions were achieved by reaction of 2-methyene-1,3-dicarbonyl compounds 1 with alkyl vinyl ethers 2. This regioselectivity of the cycloadditions was consistent with the results that could be predicted by considering the frontier orbital of 1.
M. Yamauchi, S. Katayama, O. Baba and T. Watanabe, J. Chem. Soc., Perkin Trans. 1, 1990, 3041 DOI: 10.1039/P19900003041
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