Synthesis and Transannular Diels-Alder Reaction of a 13-Membered Macrocyclic Triene. A Synthetic Approach Towards the Tricyclic Part A.B.C.[6.6.5] of the Veratrum Alkaloids - Quimpère, Miguel; Ruest, Luc; Deslongchamps, Pierre (Synthesis, 1992)