Add time:08/15/2019         Source:sciencedirect.com

A mixture of d-alloisoleucine and l-isoleucine derivatives are selectively hydrolysed by enzymatic catalysis (alcalase) allowing the recovery of the d-allo stereoisomer in excellent d.e. and yields. Thus, N-formyl-d-allo-isoleucine benzylester is obtained after enzymatic hydrolysis of the diastereoisomeric mixture or by a crystallisation procedure.

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