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Abstract
A versatile approach is described for the enantioselective synthesis of isotopically labelled L-leucine involving the preparation of 2-oxo-4-methylpentanoic acid labelled selectively with carbon-13 or deuterium in either the pro-R or pro-S methyl group followed by a reductive amination of the ketone catalysed by leucine dehydrogenase. This strategy is applied to the total synthesis of ( 2S.4R)-[5.5.5-D 3]-leucine using CD 3I as the source of deuterium.
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