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. Author manuscript; available in PMC: 2014 May 22.
Published in final edited form as: Angew Chem Int Ed Engl. 2014 Mar 3;53(10):2556–2591. doi: 10.1002/anie.201302572

Scheme 26.

Scheme 26

Lewis acid catalyzed Diels–Alder/retro-Claisen rearrangement duets appear as inverse hetero-Diels–Alder reaction. a) [Hanes-sian, 2002, Ref. [40]]; b) [Davies, 2005, Ref. [41]]