Vinyl phosphonates α-substituted with carboxylate, nitrile, sulfone and phosphonate groups reacted with N-buta-1,3-dienylsuccinimide to give [4+2] ortho-cycloadducts as mixtures of endo/exo stereoisomers.
N. Defacqz, R. Touillaux and J. Marchand-Brynaert, J. Chem. Res. (S), 1998, 512 DOI: 10.1039/A802359J
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