Tandem intramolecular benzyne–furan cycloadditions. Total synthesis of vineomycinone B2 methyl ester
作者:Steven M. Sparks、Chi-Li Chen、Stephen F. Martin
DOI:10.1016/j.tet.2007.04.031
日期:2007.8
We have exploited tandemintramolecular benzyne-furan cycloadditions employing three different benzyne precursors to generate substituted bisoxabenzonorbornadienes in a single operation. The regiochemical outcomes in these Diels-Alder reactions were effectively controlled by using disposable silicon tethers to link the reacting benzynes and furan moieties. Two different methods for converting the intermediate