G. Mehta et al., PI-FACIAL STEREOSELECTIVITIES IN DIELS-ALDER CYCLOADDITIONS TO A DISSYMMETRIC CYCLOHEXA-1,3-DIENE MOIETY IN A NOVEL, CAGED POLYCYCLIC FRAMEWORK, Journal of the Chemical Society. Perkin transactions. I, (15), 1994, pp. 2049-2050
Novel polycyclic 1,3-dienes 4 and 5 have been synthesised and shown to
undergo Diels-Alder cycloadditions exclusively from the carbonyl face
. Steric environment seems to be predominantly responsible for the obs
erved stereochemistry.