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 Claisenrearrangement 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.