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Beilstein J. Org. Chem. 2012, 8, 1385–1392, doi:10.3762/bjoc.8.160
Graphical Abstract
Figure 1: An assortment of natural products synthesized by Diels–Alder reactions.
Figure 2: Intermediates towards the total synthesis of (−)-Δ9-tetrahydrocannabinol (4).
Scheme 1: Synthesis of thiourea catalysts 9a–l.
Scheme 2: Organocatalytic Diels–Alder reaction with thiourea-catalysis.
Figure 3: Formation of the iminium-ion.
Scheme 3: Synthesis of electron poor imidazolidinone catalysts.
Figure 4: Crystal structure of the side product from the reaction of 13.
Figure 5: Confirmation of the relative configuration with NOESY experiments and X-ray crystal structures of t...
Scheme 4: Co-catalyst screening.
Scheme 5: Screening of imidazolidinone catalysts 15.