Investigations on the [2,3]-Wittig Rearrangement of Chiral 4-Aminopropargyloxy Acetates to Novel α-Hydroxy-γ-amino Acids Containing an Allene Unit
摘要:
The [2,3]-Wittig rearrangement of propargyloxy acetates bearing a propargylic stereocenter opposite to the oxyacetic acid moiety gives -hydroxy--amino acids containing an allene unit under high stereocontrol. The resulting product displays a novel type of -amino acid with a potentially intriguing biological profile.
protected chiral γ-amino acetylenic esters have been synthesized using natural occurring amino acids as chiral source. Enantiomericallyenriched propargylamines or vinyldibromides have been treated with BuLi at low temperature affording, after carboxylation, enantiomericallyenriched derivatives of alkynologous amino esters.