Diels or no Diels: The titled reaction of aldehydes, anilines, and cyclopentadiene, promoted by 0.5–5 mol % of an N,N′-dioxide scandium complex, afforded ring-fused tetrahydroquinolines that contained three contiguous stereocenters. The one-pot reaction delivers the products with good yields and excellent diastereo- and enantioselectivities.
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Xie et al. (2010) studied this question.