Process for the preparation of...

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C - Chemistry, Metallurgy

07

H

C07H 5/02 (2006.01) C07D 317/20 (2006.01) C07D 317/26 (2006.01) C07H 9/04 (2006.01)

Patent

CA 2167895

A process for producing intermediate compounds 2- deoxy 2,2-difluoro-.beta.-D-ribo-pentopyranose (III) from 3,3- difluoro-4,5,6- trihydroxy-5,6-O-(1-ethylpropylidene)hexene (I). The process of preparing intermediate compound (I) involves reacting D-glyceraldehyde pentanide with an organometallic complex of 3-bromo-3,3-difluoropropene. The process of preparing intermediate compound (III) involves ozonolysis and then hydrolysis. The intermediate compounds (I) and (III) are used in the preparation of 2'-deoxy-2',2'- difluorocytidine which is an antiviral agent.

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