Practical Enantioselective Synthesis of β-Substituted-β-amino Esters
作者:Alok K. Awasthi、Mark L. Boys、Kimberly J. Cain-Janicki、Pierre-Jean Colson、Wendel W. Doubleday、Joseph E. Duran、Payman N. Farid
DOI:10.1021/jo050177h
日期:2005.7.1
A practical, large-scale synthesis of a β-amino ester 1 was developed. A chiralimine derived from (S)-phenylglycinol and 3-trimethylsilylpropanal was coupled with the Reformatsky reagent 3 with high diastereoselectivity (de > 98%) to give (SS)-4a as the major isomer. The amino alcohol residue of the coupling product 4 was oxidatively cleaved with sodium periodate in the presence of methylamine. An