Resolution of (±)-mandelic- and (±)-2-(chlorophenoxy)propionic-acid derivatives by crystallization of their diastereomeric amides with (R)- or (S)-α-arylethylamines
An alternative and cost effective route for the resolution in high ees (95-99%) of (+/-)-mandelic and (+/-)-2-(chlorophenoxy)propionic- acid derivatives is reported. The key step involves the covalent derivatization and separation of their diastereomeric amides with (R)- or (S)-alpha-arylethylamines. (C) 1999 Elsevier Science Ltd. All rights reserved.
CARLSON, ASA;GYLLENHAAL, OLLE, J. CHROMATOGR., 508,(1990) N, C. 333-339