Microbial Reduction and Resolution of Herbicidal 2-Alkyl-2-aryloxyacetic Acids by Gloeosporium olivarum

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When a mold, Gloeosporium olivarum, was fermented with (±)-2-alkyl-2-aryloxyacetic acids (1-8), an enantioselective microbial reduction as well as microbial resolution took place, giving rise to (S)-2-alkyl-2-aryloxyethanols (1a-8a) and (R)-2-alkyl-2-aryloxyacetic acids (1b-8b). The configurations of the chiral 2-alkyl-2-aryloxyethanols and 2-alkyl-2-aryloxyacetic acids were consistent with those of the corresponding products formed by Glomerella cingulata, with the sole exception of 8b. The (R)-(+)-α-methoxy-α-trifluoromethylphenylacetic acid (MTPA) esters of the (S)-2-alkyl-2-aryloxyethanols showed larger lanthanide-induced shifts for the methoxy groups (1a, 4a-8a) or an aromatic proton (2a) in the nuclear magnetic resonance (NMR) spectra than the esters of the corresponding (R)-2-alkyl-2-aryloxyethanols. This result can be applied generally for the determination of the absolute configuration of 2-alkyl-2-aryloxyethanols.
社団法人日本薬学会の論文
1985-05-25