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Process for the preparation of chiral 8-(3-aminopiperidin-1-yl)-xanthines

  • US 9,751,855 B2
  • Filed: 01/25/2017
  • Issued: 09/05/2017
  • Est. Priority Date: 11/05/2004
  • Status: Active Grant
First Claim
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1. A process for preparing (R)-3-(phthalimido)piperidine, comprising:

  • reacting rac-3-aminopiperidine with phthalic anhydride; and

    precipitating (R)-3-(phthalimido)piperidine by adding D-tartaric acid.

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