The first enantioselective synthesis of optically pure (R)- and (S)-5,5″-dihydroxy-4′,4‴,7,7″-tetramethoxy-8,8″-biflavone and the reconfirmation of their absolute configuration
作者:Guo-Qiang Lin、Min Zhong
DOI:10.1016/s0040-4039(96)02475-6
日期:1997.2
The first enantioselective synthesis of the opticallypure (R)- and (S)-5,5″-dihydroxy-4′,4‴,7,7″-tetramethoxy-8,8″-biflavone is described. The key steps involve the intramolecular oxidative coupling of the cyanocuprate intermediate and Friedel-Crafts rearrangement. Their absoluteconfiguration was reconfirmed by CD spectra.