Straightforward Synthesis of (<i>S</i>)- and (<i>R</i>)-α-Trifluoromethyl Proline from Chiral Oxazolidines Derived from Ethyl Trifluoropyruvate
作者:Grégory Chaume、Marie-Céline Van Severen、Sinisa Marinkovic、Thierry Brigaud
DOI:10.1021/ol062593+
日期:2006.12.1
concise synthesis of both enantiomers of alpha-Tfm-proline and (S)-alpha-Tfm-prolinol from ethyl trifluoropyruvate is reported. The key step is a diastereoselective allylation reaction of ethyl trifluoropyruvate and (R)-phenylglycinol-based oxazolidines or imine. The lactone obtained by cyclization of the resulting hydroxy ester proved to be a valuable intermediate for the synthesis of (S)-alpha-Tfm-allylglycine