Direct resolution of α-monoalkyl-α-aryloxyacetic acids via ester or imide derivatives
摘要:
This paper describes a simple procedure for the resolution of racemic alpha-monoalkyl alpha-aryloxyacetic acids, using the chromatographic separation of their covalent derivatives. (R)-Ethyl mandelate, (R)-pantolactone and (S)-4-(1-methylethyl)-2-oxazolidinone are the resolving agents involved in the formation of equimolecular diastereomeric mixtures of esters or imides. Chromatograpkic resolutions were performed by means of gas chromatography (GC), thin-layer chromatography (TLC) and flash chromatography. Successive hydrolysis of separated diastereomers provided optically pure aryloxyacetic acids. (C) 1998 Elsevier Science S.A.
This paper describes a simple procedure for the resolution of racemic alpha-monoalkyl alpha-aryloxyacetic acids, using the chromatographic separation of their covalent derivatives. (R)-Ethyl mandelate, (R)-pantolactone and (S)-4-(1-methylethyl)-2-oxazolidinone are the resolving agents involved in the formation of equimolecular diastereomeric mixtures of esters or imides. Chromatograpkic resolutions were performed by means of gas chromatography (GC), thin-layer chromatography (TLC) and flash chromatography. Successive hydrolysis of separated diastereomers provided optically pure aryloxyacetic acids. (C) 1998 Elsevier Science S.A.