Asymmetric syntheses via heterocyclic intermediates-XXII
作者:Ulrich Schöllkopf、Joachim Nozulak、Ulrich Groth
DOI:10.1016/s0040-4020(01)82426-1
日期:1984.1
Enantioselective syntheses of α-alkenyl glycines of type 10 and of type 23 are described that provide these uncommon amino acids with predictable configuration and with ee-values of >95%. Both approaches are based on the bislactim ether method developed by Schöllkopf . As for 10: The lithiated bis-lactim ether 6 of cyclo (L-val-gly) is reacted with 2-[(dimethyl t-butyl)silyl]alkanals 2 to give the