Asymmetric synthesis of β-hydroxy-α-alkylamino acids by asymmetric aldol reaction of α-isocyanocarboxylates catalyzed by chiral ferrocenylphosphine-gold(I) complexes
Aldolreaction of methyl α-isocyanocarboxylates (CNCH(R)COOMe: R = H, Me, Et, i-Pr) with benzaldehyde or acetaldehyde in the presence of 0.5–1.0 mol% of a chiral (aminoalkyl)ferrocenylphosphine-gold(I) complex gave optically active 4-methoxycarbonyl-4,5-dialkyl-2-oxazolines with high enantioselectivity in a quantitative yield. The oxazolines were converted into optically active β-hydroxy-α-alkylamino