Stereoselective intramolecular acylation of γ′-benzoyloxyphosphine oxides with an internal chlorotrimethylsilane trap: isolation of silylated tetrahedral intermediates
Stereoselective acyl transfer reactions controlled by the diphenylphosphinoyl group: X-ray structures of stable crystalline silylated tetrahedral intermediates
作者:Neil Feeder、Gordon Hutton、Stuart Warren
DOI:10.1016/s0040-4039(00)78217-7
日期:1994.8
Acyltransfer with LDA on benzoates of single diastereoisomers of 3-hydroxyalkyldiphenylphosphine oxides in the presence of trimethylsilyl chloride gives silylated tetrahedral intermediates in carbonyl displacement reactions with the stereochemically controlled creation of two new chiral centres. X-rays reveal the stereochemistry.
Stereoselective intramolecular acylation of γ′-benzoyloxyphosphine oxides with an internal chlorotrimethylsilane trap: isolation of silylated tetrahedral intermediates
The kinetic products of the intramolecular acylation of γâ²-benzoyloxyphosphine oxides were revealed by conducting the reaction in the presence of an internal trapping agent. A high level of stereocontrol over the formation of both the stereogenic centre α to phosphorus and the hemiacetal centre was observed. The stereochemistry of the products was determined by X-ray crystallography and 1H NMR and the stereoselectivity of the reaction is explained in terms of the known structure and configurational instability of lithiated phosphine oxides.