950204-27-0Relevant academic research and scientific papers
METHOD FOR PURIFYING 4-HYDROXYISOLEUCINE
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Page/Page column 12-13, (2009/12/07)
The present invention aims to provide a method of conveniently isolating and purifying as well as separating and removing (2S,3R,4S)-4-hydroxyisoleucine at a high purity and in a high yield. Specifically, the present invention discloses a purification method of (2S,3R,4S)-4-hydroxyisoleucine or a chemically acceptable salt thereof, which includes the following steps (a), (b) and (c): (a) a step of reacting (2S,3R,4S)-4-hydroxyisoleucine or a chemically acceptable salt thereof in a mixture with an aldehyde compound represented by the formula: Q-CHO wherein Q is an aryl group having a carbon number of 6 to 14, an alkyl group having a carbon number of 1 to 10, a cycloalkyl group having a carbon number of 3 to 10 or a 5- to 10-membered heterocyclic group, each of which optionally has substituent(s), or an equivalent form thereof to give a compound represented by the formula (1) wherein Q is as defined above, (b) a step of extracting the compound represented by the formula (1) with an organic solvent, and (c) a step of converting the compound represented by the formula (1) to (2S,3R,4S)-4-hydroxyisoleucine or a chemically acceptable salt thereof.
