Stannylation and Stille Coupling of Base-Sensitive Tetrahydroxanthones to Heteromeric Biaryls
作者:Stephanie Lindner、Martin Nieger、Stefan Bräse
DOI:10.1002/adsc.201500524
日期:2015.10.12
Herein, the synthesis of heteromerictetrahydroxanthonebiaryls is described, a widespread core structure of many natural products. The development of both stannylation and Stillecoupling procedures of base-sensitivetetrahydroxanthones enabled their coupling with benzene derivatives as well as with xanthenes. These methods provide access to structures that are analogous to parnafungins as well as
Lewis Acid Promoted Double Bond Isomerization of Tetrahydroxanthones
作者:Anna M. Linsenmeier、Stefan Bräse
DOI:10.1002/ejoc.201201009
日期:2012.11
Herein, a method for the isomerization of the double bonds in tetrahydroxanthones is reported. Tetrahydroxanthones are readily available from salicylaldehydes and cycloalkenones and undergo isomerization upon treatment with AlCl3. The mechanism of the isomerization and follow-up chemistry of the products were investigated. Follow-up chemistry such as asymmetric Corey–Bakshi–Shibata (CBS) reduction