207. Synthesis of α-amino-β-hydroxy-acids. Part I.DL-allothreonine,DL-erythro-β-hydroxyleucine, andDL-erythro- and threo-β-hydroxy-β-methylaspartic acid
Asymmetricaldolreaction of α-ketoesters (RCOCOOMe: R = Me, i-Bu, Ph) with methyl isocyanoacetate or N, N-dimethyl-α-isocyanoacetamide in the presence of 1 mol% of a chiral (aminoalkyl) ferrocenylphosphine-gold(I) catalyst proceeded with high enantioselectivity to give corresponding oxazolines of up to 90% ee, which were converted into optically active β-alkyl-β-hydroxyaspartic acid derivatives.