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Industrial Biotransformations

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74<br />

3 Retrosynthetic Biocatalysis<br />

3.13<br />

Amino Acids<br />

X = O, NH<br />

R<br />

R<br />

O<br />

NH 2<br />

OH<br />

O<br />

NH 2<br />

OH<br />

amidase<br />

transaminase<br />

amino acid<br />

dehydrogenase<br />

nitrilase<br />

amidase or<br />

hydrolase<br />

hydantoinase<br />

lipase<br />

tryptophan<br />

synthase<br />

tyrosine<br />

phenol lyase<br />

Cl<br />

R<br />

R<br />

R<br />

R<br />

R<br />

O<br />

O<br />

O<br />

NHAc<br />

a-Amino acids can be synthesized from amides or esters by enzymatic hydrolysis, aketo<br />

acids by enzymatic transamination [34] or reductive amination, hydrolysis of hydantoins<br />

or amino nitriles by nitrilases [35].<br />

R<br />

R<br />

O<br />

O<br />

NH2<br />

CN<br />

O<br />

NH 2<br />

HN<br />

N<br />

O<br />

O<br />

O<br />

NH 2<br />

OR<br />

OH<br />

OH<br />

XR<br />

NH<br />

o<br />

O<br />

Ph<br />

OH

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