The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 2018
Filed:
Feb. 25, 2016
Johnson Matthey Public Limited Company, London, GB;
Daniel James Coughlin, Mullica Hill, NJ (US);
Johnson Matthey Public Limited Company, London, GB;
Abstract
A method of preparing purified decitabine comprises mixing crude decitabine with solvent, such as dimethylacetamide, to form a solution or suspension and forming the purified decitabine from the solution or suspension. The forming step comprises adding an anti-solvent, such as ethanol, to the solution or suspension. The forming step may further comprise after adding ethanol to provide a mixture of dimethylacetamide and ethanol: cooling the mixture; isolating the solid decitabine present in the cooled mixture; and evaporating residual dimethylacetamide and ethanol from the solid decitabine to provide the purified decitabine. The mixture of dimethylacetamide and ethanol may be heated. The purification method preferably results in decitabine having a ratio of the β-anomer of decitabine to the α-anomer of decitabine of at least about 99.9:0.1.