(4R,5S)-1,5-Dimethyl-4-phenylimidazolidin-2-one as a chiral auxiliary for the diastereoselective alkylation of a new iminic glycine derivative: practical asymmetric synthesis of α-amino acids
作者:Gabriela Guillena、Carmen Nájera
DOI:10.1016/s0957-4166(98)00113-x
日期:1998.4
The lithium enolate of enantiomerically pure N-[bis(methylthio)methylene] glycinate 11 derived from (4R,5S)-1,5-dimethyl-4-phenylimidazolidin-2-one reacts with alkyl halides giving the alkylated derivatives 12 with a high degree of control of the diastereoselectivity. These alkylated systems are easily hydrolyzed to the corresponding cx-amino acids, the chiral auxiliary being recovered. (C) 1998 Elsevier Science Ltd. All rights reserved.