Ring-Closing Metathesis in the Synthesis of BC Ring-Systems of Taxol
作者:Cong Ma、Stéphanie Schiltz、Xavier F. Le Goff、Joëlle Prunet
DOI:10.1002/chem.200800774
日期:2008.7.3
BCring-systems of taxol with different or no protecting group for the C1,C2-diol moiety have been efficiently synthesized. The eight-membered B ring is formed by a ring-closingmetathesis reaction (RCM) between the C10 and C11 carbon atoms. The influence of the 1,2-diol protecting group on the RCM reaction has been studied in detail.
Model BCring-systems of taxol 23b and 28b, which lack an oxygenated substituent at C7, have been efficiently synthesized. The key step is a ring-closingmetathesis (RCM) to form the 8-membered B ring between C10 and C11. Comparison of the metathesis reaction in this route with the RCM used in a previous study with similar substrates is highlighted.