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Industrial Biotransformations

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Oxidase<br />

Beauveria bassiana<br />

HO<br />

O COOH<br />

2-(4-hydroxy-phenoxy)-butyric acid<br />

HO<br />

F<br />

COOH<br />

2-(2-fluoro-4-hydroxy-phenoxy)-propionic acid<br />

O<br />

O<br />

O<br />

OH<br />

OH<br />

(4-hydroxy-naphthalen-1-yloxy)-acetic acid<br />

OH<br />

O COOH<br />

2-[4-(1-hydroxy-ethyl)-phenoxy]-propionic acid<br />

Fig. 1.X.X.X – 2<br />

● A compound needs the structural elements of a carboxylic acid and an aromatic ring system to<br />

be a substrate for the oxidase. Hydroxylation primarily takes place in phenoxy-derivatives at<br />

the para position if it is free. If there is an alkyl group in the para position, only side-chain<br />

hydroxylation takes place. In systems with more than one ring, the most electron-rich ring is<br />

hydroxylated.<br />

● The ee is increased during oxidation from 96 % for POPS to 98 % for HPOPS.<br />

262<br />

HO<br />

O<br />

4-(4-hydroxy-phenoxy)-benzoic acid<br />

HO<br />

O COOH<br />

O COOH<br />

O COOH<br />

EC 1.X.X.X<br />

2-(6-hydroxy-naphthalen-2-yloxy)-propionic acid<br />

HOOC<br />

4-(1-carboxy-ethoxy)-benzoic acid<br />

HO<br />

2-[4-(2-hydroxy-1-methyl-ethyl)-phenoxy]-propionic acid<br />

O<br />

CO 2H

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