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Beilstein J. Org. Chem. 2018, 14, 2708–2714, doi:10.3762/bjoc.14.248
Graphical Abstract
Scheme 1: Metathesis of norbornene derivatives.
Figure 1: Structures of retigeranic acids A (1a) and B (1b).
Scheme 2: Synthesis plan.
Scheme 3: Metathesis of norbornene derivatives 7a and 7b.
Figure 2: ORTEP of compound 13 (ellipsoids at 30% probability).
Scheme 4: Metathesis of the norbornene derivative 17.
Figure 3: Probable metathesis intermediates.