R. Leclerc et D. Uguen, A CONVENIENT PREPARATION OF OPTICALLY PURE 3-HYDROXYGLUTARIC ACID-DERIVATIVES, Tetrahedron letters, 35(13), 1994, pp. 1999-2002
The diastereomeric monoamides resulting from condensation of (L)-cyste
ine with 3-hydroxyglutarodinitrile have been separated by chromatograp
hy then transformed in a few steps into either (+) or (-) methyl ester
of 4-cyano-3-hydroxybutyric acid.