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:
Aug. 11, 2009
Filed:
May. 24, 2006
Lung-hu Wang, Shan-Hua, TW;
George Schloemer, Shan-Hua, TW;
Allen Liu, Shan-Hua, TW;
ScinoPharm Taiwan, Ltd., Tainan County, TW;
Abstract
A process of preparing an alpha-anomer enriched 2-deoxy-2,2-difluoro-D-ribofunanosyl sulfonate, which is useful as an intermediate in the preparation of a beta nucleoside, such as gemcitabine, an anti-tumor agent. A beta-2-deoxy-2,2-difluoro-D-ribofunanosyl sulfonate is heated and converted to an alpha-2-deoxy-2,2-difluoro-D-ribofunanosyl sulfonate in the absence of an effective amount of a sulfonate salt to facilitate the conversion. In addition, an anomeric mixture of an alpha-anomer and a beta-anomer of 2-deoxy-2,2-difluoro-D-ribofunanosyl sulfonate can be dissolved in a mixture of water and a solvent and heated to produce a lactol, which may be further converted to an alpha-anomer enriched 2-deoxy-2,2-difluoro-D-ribofunanosyl sulfonate.