Methods for the production of 3-methylamino-1-(thiene-2-yl)-propane-1-ol

1. A process for preparing (S)-3-methylamino-1-(thien-2-yl)propan-1-ol of the formula I-S

comprising

a) reacting thiophene is with a β-halopropionyl halide or an acryloyl halide in the presence of a Lewis acid to give a 3-halo-1-(thien-2-yl)propan-1-one, with a hydrogen halide being passed in simultaneously or after the reaction has taken place, but before the reaction product is isolated, and

b) reducing the propanone obtained in step a) and then reacting with methylamine; wherein step b) is carried out in the presence of a dehydrogenase which exhibits selectivity with regard to the formation of (S)-3-methylamino-1-(thien-2-yl)propan-1-ol.

2. The process as claimed in claim 1 , wherein the dehydrogenase is an alcohol dehydrogenase.

3. The process as claimed in claim 1 , wherein the dehydrogenase is selected from among dehydrogenases from yeasts of the genus Geotrichum, Pichia, Candida, Hansenula or Saccharomyces and from bacteria of the genus Pseudomonas, Burkholderia, Agrobacterium, Rhodococcus or Lactobaccillus.

4. A process as claimed in claim 3 , wherein the dehydrogenase is selected from among dehydrogenases from Geotrichum candidum, Candida magnoliae and Lactobaccillus brevis.

5. The process as claimed in claim 1 , wherein the dehydrogenase employed is an alcohol dehydrogenase having an amino acid sequence which, in the region of the N terminus

a) comprises a constituent amino acid sequence of at least 10 consecutive amino acid residues as depicted in SEQ ID NO: 1, with the position corresponding to amino acid position 12 as depicted in SEQ ID NO: 1 additionally standing for valine; or a

b) constituent amino acid sequence of at least 10 consecutive amino acid residues as depicted in SEQ ID NO: 2

or a dehydrogenase produced by a natural or recombinant microorganism.

6. A process for preparing (S)-3-methylamino-1-(thien-2-yl)propan-1-ol of formula I-S comprising reducing a 3-halo-1-(thien-2-yl)propan-1-one enantioselectively, wherein the reduction is effected in the presence of a dehydrogenase, producing a (S)-3-methylamino-1-(thien-2-yl)propan-1-ol of the formula I-S.

7. The process as claimed in claim 5 , wherein the (S)-3-halo-1-(thien-2-yl)propan-1-ol which is obtained in the reduction is reacted with methylamine without being isolated.

8. The process as claimed in claim 5 , wherein the dehydrogenase is selected from among dehydrogenases from yeasts of the genus Geotrichum, Pichia, Candida, Hansenula or Saccharomyces and from bacteria of the genus Pseudomonas, Burkholderia, Agrobacterium, Rhodococcus or Lactobaccillus.

9. The process as claimed in claim 7 , wherein the dehydrogenase is selected from among dehydrogenases from Geotrichum candidum, Candida magnoliae or Lactobaccillus brevis.

10. The process as claimed in claim 5 , wherein the dehydrogenase is selected from among alcohol dehydrogenases selected from the group consisting of

a) a dehydrogenase capable of reducing 3-chloro-1-(thien-2-yl)propan-1-one to (S)-3-chloro-1-(thien-2-yl)propan-1-ol;

b) a dehydrogenase which catalyzes the reduction in an enantiomeric purity of at least 85% ee (in the presence of NADH and/or NADPH; at 30° C. and pH 6.0);

c) a dehydrogenase which is encoded by a nucleic acid sequence comprising SEQ ID NO: 3 or which comprises an amino acid sequence as depicted in SEQ ID NO: 4 or at least a constituent sequence as depicted in FIG. 3 , and can preferably be obtained from Lactobaccillus brevis ; or functionally an equivalent alcohol dehydrogenase which is derived therefrom; and

d) a dehydrogenase which is encoded by a nucleic acid sequence comprising SEQ ID NO: 5 or which possesses an amino acid sequence comprising SEQ ID NO: 6 and can preferably be obtained from Candida magnoliae (ATCC 12573); or a functionally equivalent alcohol dehydrogenase which is derived therefrom.