The Preparation of 6-Bromo-3,4-dihydro-2H-pyrans from Tetrahydropyran-2-ones via a Ni(0)-catalysed Coupling Reaction and their Halogen-metal Exchange to 6-Lithio-3,4-dihydro-2H-pyrans. - Milne, Jacqueline E; Jarowicki, Krzysztof; Kocienski, Philip J (Synlett, 2002)