SCHEDULED MAINTENANCE
Several 3,4-disubstituted 3-sulfolenes 1a–j, the precursors for the corresponding 2,3-disubstituted 1,3-dienes 2a–j, are conveniently prepared and undergo Diels–Alder reactions smoothly with methyl acrylate under thermal conditions where the order of para-directing ability of different substituents is OTBS≃CN > SPh > OMe≃CO2Me > OTs > OAc.
T. Chou, C. Chang, M. Wu, S. Hung, H. Liu and W. Yeh, J. Chem. Soc., Chem. Commun., 1992, 1643 DOI: 10.1039/C39920001643
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