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Beilstein J. Org. Chem. 2010, 6, No. 64, doi:10.3762/bjoc.6.64
Graphical Abstract
Scheme 1: Diels–Alder bis-adducts of 1 with cyclic dienes.
Scheme 2: Diels–Alder reaction of 1a with 3-sulfolene.
Scheme 3: Synthesis of bis-oxa-bridged compounds 8 and 10 from bis-adducts 5 and 6.
Figure 1: ORTEP structure of 8 [50% probability thermal ellipsoids; some of the hydrogen atoms and a solvent ...
Scheme 4: Diels–Alder reaction of 1b with 3-sulfolene.
Scheme 5: Synthesis of bis-oxa-bridged compounds 8 and 10 from bis-diketones 14 and 15.
Figure 2: 1H NMR chemical shifts (in parentheses) and coupling constants (J) for the three interacting proton...
Figure 3: Transition state models for the bis-adduct formation.