Efficient synthesis of a key intermediate of DV-7751 via optical resolution or microbial reduction.

  title={Efficient synthesis of a key intermediate of DV-7751 via optical resolution or microbial reduction.},
  author={Akihiko Miyadera and Koji Satoh and Akihiro Imura},
  journal={Chemical \& pharmaceutical bulletin},
  volume={48 4},
Two efficient and practical methods of synthesis of the C-10 substituent of DV-7751 (1), a novel quinolone carboxylic acid, were established. The first method utilizes an optical resolution of racemic 8-amino-6-benzyl-6-azaspiro[3.4]octane (13), while the second employs an enantioselective microbial reduction of 6-benzyl-5,8-dioxo-6-azaspiro[3.4]octane (8b). The enantiomeric excess of (S)-8-amino-6-benzyl-6-azaspiro[3.4]octane (11) with each method of synthesis is greater than 96%. 
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