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We report a novel synthesis of (S)-aspartate semi-aldehyde, (S)-ASA, 1, a key intermediate in the biosynthesis of lysine, based on hydrolysis of an enol ether precursor, (S)-2-amino-4-methoxybut-3-enoic acid, 10. (S)-ASA is conveniently and quantitatively liberated from this stable intermediate and can be used in biological studies directly, since methanol is the only side-product. Enzyme inhibition...
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