Appeal No. 1997-0481
Application No. 08/161,071
Claim 19 is illustrative of the subject matter on appeal and is reproduced
below:
19. A process for obtaining a 2’,3’-dideoxy-2’,3’-didehydronucleoside of
formula (VIII):
wherein B is an unsubstituted or 5-substituted uracil residue bound at its 1-position,
and R2 is a hydrogen atom, an acyl group, an aralkyl group, or a silyl group, said
process comprising reacting, with an acid anhydride, a nucleoside derivative of
formula (VII):
wherein R1 is an alkyl group having 1 to 12 carbon atoms and B is identical to the
uracil residue of formula (VIII).
2
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