Patent ID: 7122696
Filing Date: 2006-10-17
Classification: C07B,C07C,C07D

Abstract:
1. A process for producing a (2R,3S)-N-tert-butoxycarbonyl-β-aminoalcohol or a (2S,3R)-N-tert-butoxycarbonyl-β-aminoalcohol, comprising: crystallizing a compound represented by formula (1) or (2): wherein Y represents an alkyl group of 1 to 10 carbon atoms, an aryl group of 6 to 15 carbon atoms or an aralkyl group of 7 to 20 carbon atoms, each of which may have substituent(s); and X represents a halogen atom, wherein X and Y are each as defined above, from a diol or a diol-based mixed solvent.