Total Synthesis of Russuphelol: A Case of Mistaken Chirality
作者:M. Quamar Salih、Christopher M. Beaudry
DOI:10.1021/ol502459p
日期:2014.9.19
The chlorohydroquinone tetramer, russuphelol, does not have stereocenters; however, it was reported as a chiral optically active substance with stable enantiomeric conformations. The natural product is synthesized in six steps and 14% overall yield. Synthetic material was used to experimentally investigate its chiral properties.
Regioselective Synthesis of Unsymmetrical <i>C</i>-Aryl Glycosides Using Silicon Tethers as Disposable Linkers
作者:David E. Kaelin、Steven M. Sparks、Hilary R. Plake、Stephen F. Martin
DOI:10.1021/ja0375582
日期:2003.10.1
regiochemistry of Diels-Alderreactions between substituted benzynes and glycosyl furans as a key step in the syntheses of unsymmetrical representatives of three major groups of C-aryl glycosides. The cycloaddition precursors were readily prepared by O-alkylation of substituted phenols with various sugar-substituted furylsilane derivatives. Selective deprotonation on the benzene ring of these ethers led to a
An unexpected nucleophilic chlorination of a quinone monoketal while carrying out a pyrazolidine synthesis has led to a general preparation of multisubstituted phenols. The products are obtained in good to high yields under mild conditions. The bridged pyrazolidines that were the original targets are obtained in the presence of a protic solvent.