Total Synthesis of Hamigerans: Part 2. Implementation of the Intramolecular Diels-Alder Trapping of Photochemically Generated Hydroxy-o-quinodimethanes; Strategy and Completion of the Synthesis This work was financially supported by the National Institutes of Health (USA) and The Skaggs Institute for Chemical Biology, and grants from Abbott, Amgen, ArrayBiopharma, Boehringer-Ingelheim, Glaxo, Hoffmann-La Roche, DuPont, Merck, Pfizer, and Schering Plough

Angew Chem Int Ed Engl. 2001 Oct 1;40(19):3679-3683. doi: 10.1002/1521-3773(20011001)40:19<3679::aid-anie3679>3.0.co;2-t.
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