Ho

418aa'

418aa'

This results led us to study the biotransformation of (-)-pinane-2,3-diol (418ab') and (+)-pinane-2,3-diol (418ab) by Aspergillus niger TBUYN-2. (-)-Pinane-2,3-diol (418ab') was easily biotrans-formed to give (-)-pinane-2,3,5-triol (419ab') and (+)-2,5-dihydroxy-3-pinanone (415a') as the major products and (+)-2-hydroxy-3-pinanone (414a') as the minor product.

On the other hand, (+)-pinane-2,3-diol (418ab) was also biotransformed easily to give (+)-pinane-2,3,5-triol (419ab) and (-)-2,5-dihydroxy-3-pinanone (415a) as the major products and (-)-2-hydroxy-3-pinanone (414a) as the minor product (Noma et al., 2003) (Figure 14.172). Glomerella cingulata transformed (-)-pinane-2,3-diol (418ab') to a small amount of (+)-2a-hydroxy-3-pinanone (414ab', 5%) (Kamino and Miyazawa, 2005), whereas (+)-pinane-2,3-diol (418ab) was transformed to a small amount of (-)-2a-hydroxy-3-pinanone (414ab, 10%) and (-)-3-acetoxy-2a-pinanol (433ab-Ac, 30%) (Kamino et al., 2004) (Figure 14.172).

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