Both enantiomers of α-benzyl and α-carboxymethyl serines (1, 2) were efficiently synthesized starting with the known phenyl acetol via an intramolecular asymmetric Strecker synthesis.
α-Hydroxymethylaspartic acid: Synthesis and absolute configuration by X-ray analysis of its derivative (+)-4-benzoylamino-4-carboxy-γ-butyrolactone
作者:Wanda Wieczorek、Maria Bukowska-Strzyżewska、Aleksandra Olma、Zbigniew J. Kamńnski、Mirosław T. Leplawy
DOI:10.1007/bf01161050
日期:1991.4
(+)-4-Benzoylamino-4-carboxy-gamma-butyrolactone was synthesized, and its structure solved by direct methods and refined to R = 0.033. The molecule adopts a skew conformation with a C7-N1-C8-C12 torsion angle of 59.6(2)degrees. The lactone ring has an envelope conformation, with the C-alpha(8) atom deflected from the ring plane. The absolute configuration of (+)-benzylamino-4-carboxy-gamma-butyrolactone 5 was assigned as R by the application of Hamilton's test to the unique diffraction data, and confirmed by the estimation of the Bijvoet coefficient B from hkl and hklBAR diffraction data. This result proves the R configuration for (+) enantiomer of the parent alpha-hydroxymethylaspartic acid.