New and efficient approaches to the semisynthesis of taxol and its C-13 side chain analogs by means of β-lactam synthon method
作者:Iwao Ojima、Ivan Habus、Mangzhu Zhao、Martine Zucco、Young Hoon Park、Chung Ming Sun、Thierry Brigaud
DOI:10.1016/s0040-4020(01)91210-4
日期:1992.1
Highly efficient chiral ester enolate-imine condensation giving 3-hydroxy-4-aryl-β-lactams with excellent enantiomericpurity is successfully applied to the asymmetric synthesis of the enantiomerically pure taxol C-13 side chain, N-benzoyl-(2R,3S)-3-phenyl-isoserine and itsanalogs. (3R,4S)-N-benzoyl-3-(1-ethoxyethoxy)-4-phenyl-2-azetidinone readily derived from the 3-hydroxy-4-phenyl-β-lactam is coupled
New and efficient routes to norstatine and its analogs with high enantiomeric purity by β-Lactam Synthon Method
作者:Iwao Ojima、Young Hoon Park、Chung Ming Sun、Thierry Brigaud、Mangzhu Zhao
DOI:10.1016/0040-4039(92)89019-9
日期:1992.9
Norstatine and itsanalogs, i.e., 3-amino-2-hydroxyalkanoic acids, with highenantiomericpurity are obtained through effecient asymmetric synthesis of 3-silyloxy-β-lactams by chiral enolate - imine cyclocondensation, followed by hydrolysis.