An ester exchange reaction of β-butoxy-β-acyloxyvinyl-λ3-iodane with lithium bases (ROLi and nBuLi) efficiently generates highly labile monoester iodonium ylide at low temperature. The iodonium ylide generated in situ cleanly undergoes Darzens condensation with aromatic aldehydes to afford trans-epoxy ester selectively.
A practical chemoenzymic synthesis of the taxol C-13 side chain N-benzoyl-(2R,3S)-3-phenylisoserine
作者:Da Ming Gou、Yeuk Chuen Liu、Ching Shih Chen
DOI:10.1021/jo00057a054
日期:1993.2
METH-COHN, OTTO;MOORE, CLIVE;TALJAARD, HEINRICH C., J. CHEM. SOC. PERKIN TRANS. PT I,(1988) N, C. 2663-2674
作者:METH-COHN, OTTO、MOORE, CLIVE、TALJAARD, HEINRICH C.
DOI:——
日期:——
A stereocontrolled approach to electrophilic epoxides
作者:Otto Meth-Cohn、Clive Moore、Heinrich C. Taljaard
DOI:10.1039/p19880002663
日期:——
Lithium t-butyl hydroperoxide (easily generated by addition of an alkyl-lithium to anhydrous t-butyl hydroperoxide in THF solution) is a powerful reagent for the epoxidation of electrophilic alkenes at –20 to 0 °C under full stereocontrol.