Synthesis of Dihydropyrans via Pd-catalyzed Cyclization of 2-allyl-1,3-dicarbonyl Compounds and Vinylic Triflates Or Halides
The palladium-catalyzed reaction of 2-allyl-1,3-dicarbonyl compounds with vinylic triflates or halides affords dihydropyran derivatives, most probably through the intermediacy of η 3-allylpalladium complexes that undergo an intramolecular nucleophilic attack by the oxygen.
P. Reddy, "Synthesis of Dihydropyrans via Pd-catalyzed Cyclization of 2-allyl-1,3-dicarbonyl Compounds and Vinylic Triflates Or Halides," Synlett, Georg Thieme Verlag, Jan 1998.
The definitive version is available at http://dx.doi.org/10.1055/s-1998-1788
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