A manufacturing process of 2',2'-difluoronucleoside and...

C - Chemistry – Metallurgy – 07 – D

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C07D 307/32 (2006.01)

Patent

CA 2631951

The present invention relates to more improved process for preparing 2'-deoxy- 2',2'-difluoronucleoside and its intermediate. The present invention provide a process for preparing an erythro enantiomer in greater than 98% purity, comprising forming a lactone ring by hydrolyzing ethyl (3RS )-2,2-difluoro-3- hydroxy-3-(2,2-dimethyloxolan-4-yl)propionate is hydrolyzed in the presence of hydrolysis reagents selected from acetic acid or chloroacetic acid, water and a mixture of organic solvents selected from the group comprising acetonitrile, dioxane, tetrahydrofuran or toluene, in¬ troducing a substituted benzoyl protecting group at the 3-position and 5-position, and recrys- tallizing said erythro enantiomer. Further, the present invention provides a process for selectively preparing, in greater than 99% purity, a beta-anomer 2'-deoxy- 2',2'-difluoronucleoside at the 3'-position and 5'-position that are protected by a substituted benzoyl in a 2:3 alpha/beta anomeric ratio.

L'invention porte sur un procédé nouvellement amélioré de préparation de 2'-désoxy-2',2'-difluoronucléoside et de son intermédiaire, et sur un procédé de préparation d'un érythro énantiomère d'une pureté supérieure à 98 % consistant: à former un cycle lactone par hydrolyse de propionate d'éthyl (3RS )-2,2-difluoro-3-hydroxy-3-(2,2-diméthyloxolan-4-yl) en présence de réactifs d'hydrolyse choisis parmi l'acide acétique, l'acide chloroacétique de l'eau et un mélange de solvants organiques choisis parmi l'acétonitrile, le dioxane, le tétrahydrofurane ou le toluène; à introduire un groupe protecteur de benzyle substitué à la position 3 et à la position 5; et à recristalliser ledit érythro énantiomère. L'invention porte en outre sur un procédé de préparation sélective de bêta-anomère de 2'-désoxy-2',2'-difluoronucléoside d'une pureté supérieure à 99 % protégé à la position 3 et à la position 5 par du benzyle dans le rapport anomérique alpha/bêta 2:3.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

A manufacturing process of 2',2'-difluoronucleoside and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with A manufacturing process of 2',2'-difluoronucleoside and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A manufacturing process of 2',2'-difluoronucleoside and... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-2085898

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.