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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Angew Chem Int Ed Engl. 2015 Nov 4;54(49):14638–14658. doi: 10.1002/anie.201505017

Scheme 9.

Scheme 9

(A) Stoichometric DDQ-mediated oxidative intramolecular synthesis of tetrahydropyranone derivatives,[28k] and (B) subsequently-developed catalytic conditions for similar transformations.[44]