Patent ID: 11897911
Assignee: SANOFI
Field: Organic fine chemistry (Chemistry)
Classification: CPC A  C | IPC C

Claim 17:
18. A compound of formula (I′):, wherein T1 and T2 are each independently a protecting group, —C(═O)(CH2)r-COOH, or —C(═O)(CH2)r-C(═O)NH—R7,
Wherein R7 represents a solid support material, r is an integer selected from 2, 3 and 4, and wherein:
B is a heterocyclic nucleobase;
Y is O, NH, NR1 or N—C(═O)—R1, wherein R1 is:
a (C1-C20) alkyl group,
a (C3-C8) cycloalkyl group, or
a group —[C(═O)]m-R2-(O—CH2-CH2)p-R3, wherein:

 m is an integer of 0 or 1,
 p is an integer ranging from 0 to 10,
 R2 is a (C1-C20) alkylene group,
 and
 R3 is selected from the group consisting of a hydrogen atom, a (C1-C6) alkyl group, a (C1-C6) alkoxy group, a (C3-C8) cycloalkyl group, a (C3-C14) heterocycle, a (C6-C14) aryl group, and a (C5-C14) heteroaryl group,
 or
 R3 is a cell targeting moiety,

X1 and X2 are each, independently, a hydrogen atom, or a (C1-C6) alkyl group, and
each of Ra, Rb, Rc and Rd is, independently, H or a (C1-C6) alkyl group.