作者:Daniele Giallombardo、Adam C. Nevin、William Lewis、Christopher C. Nawrat、Russell R.A. Kitson、Christopher J. Moody
DOI:10.1016/j.tet.2013.12.055
日期:2014.2
A synthesis of the naturally occurring xanthone toxyloxanthoneB is described, in which the key step is the regioselective addition of a methyl salicylate to a substituted benzyne, followed by cyclization of the intermediate aryl anion to form the xanthone, the regiochemistry of the aryne addition being confirmed by X-ray crystallography. Subsequent introduction of the pyran ring by [3,3]-rearrangement