An Intramolecular Heck Reaction that Prefers a 5-<i>endo</i>- to a 6-<i>exo</i>-<i>trig</i> Cyclization Pathway
作者:David Tanner、Paulo Vital、Per-Ola Norrby
DOI:10.1055/s-2006-951504
日期:2006.11
A regioselective aromatic Claisen rearrangement was used to prepare 17a, the precursor of triflate 17e. The intramolecular Heck reaction of 17e is promoted only by bidentate phosphine ligands, giving exclusively and in excellent yield 20, the product of a 5-endo-trig cyclization, despite the possibility for a 6-exo-trig pathway.
区域选择性芳香克莱森重排用于制备三氟甲磺酸酯 17e 的前体 17a。17e 的分子内 Heck 反应仅由双齿膦配体促进,仅以优异的产率提供 20,这是 5-endo-trig 环化的产物,尽管可能存在 6-exo-trig 途径。