Rate enhancements for the Diels–Alder reaction of (2-pyridyl)methyl propenoate 2 over benzyl propenoate 1 are observed in the presence of transition-metal promoters, particularly copper(II) and zinc(II) triflate.
A. D. Westwell and J. M. J. Williams, J. Chem. Soc., Chem. Commun., 1994, 2501 DOI: 10.1039/C39940002501
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