A new polymer-supported Evans-type chiral auxiliary derived from α-hydroxy-β-amino acid, phenylnorstatine: synthesis and application in solid-phase asymmetric alkylation reactions
a polymer-supported chiral oxazolidinone was prepared starting from (2R,3S)-3-amino-2-hydroxy-4-phenylbutanoic acid (phenylnorstatine, Pns) and Wang resin. Solid-phaseasymmetric alkylation on this resin proceeded in high diastereoselectivity comparable to that of conventional solution-phase model experiments. This study suggests that anchoring through the 5-position of oxazolidinone is highly suited
Solid phase asymmetric alkylation reactions using 2-imidazolidinone chiral auxiliary
作者:Quynh Pham Bao Nguyen、Jae Nyoung Kim、Taek Hyeon Kim
DOI:10.1016/j.tetlet.2009.01.127
日期:2009.7
A novel solid supported 2-imidazolidinone chiral auxiliary was prepared from O-benzyl-l-tyrosine and Wang resin. Asymmetric alkylation reactions in the solid phase proceeded with excellent stereoselectivities, which were even higher than those observed in the conventional solution phase method.