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    • 2. 发明申请
    • Preparation of purines
    • US20050101570A1
    • 2005-05-12
    • US11011352
    • 2004-12-14
    • John Mansfield Dales
    • John Mansfield Dales
    • C07D473/40C07D473/00C07D473/32A61K31/675A61K31/522C07D473/14
    • C07D473/00
    • A process for the preparation of a compound of formula (A) wherein: X is hydrogen or hydroxy, chloro, C1-6 alkoxy or pheny C1-6 alkoxy; and Ra and Rb are hydrogen, or acyl or phosphate derivatives thereof, which process comprises: (i) the preparation of a compound of formula (I) wherein R1 is C1-6 alkyl, or phenyl C1-6 alkyl in which the phenyl group is optionally substituted; R2 is hydrogen, hydroxy, chlorine, C1-6 alkoxy, phenyl C1-6 alkoxy or amino; and R3 is halogen, C1-6 alkylthio, C1-6 alkylsulphonyl, azido, an amino group or a protected amino group, which preparation comprises the reaction of a compound of formula (II) wherein R2 and R3 are as defined for formula (I) with a compound of formula (V) wherein L is a leaving group and R1 is as defined for formula (I), to give a compound of formula (VI), and thereafter converting the intermediate compound of formula (VI) to a compound of formula (I) via decarboxylation, and as necessary or desired, interconverting variables R1, R2 and R3 to further values of R1, R2 and R3; (ii) the conversion of the resulting compound of formula (I) to a compound of formula (A) by converting variable R3, when other than amino, to amino, reducing the ester groups CO2R1 to CH2OH and optionally forming acyl or phosphate derivates thereof, and as necessary or desired converting variable R2 in the compound of formula (I) to variable X in the compound of formula (A); characterized in that R2 is chloro in formula (I).
    • 9. 发明申请
    • IRNA agents with biocleavable tethers
    • 具有生物可清除系绳的IRNA试剂
    • US20050256069A1
    • 2005-11-17
    • US10985426
    • 2004-11-09
    • Muthiah ManoharanKallanthottathil Rajeev
    • Muthiah ManoharanKallanthottathil Rajeev
    • A61K31/70A61K48/00C07D473/14C07H21/02C12Q1/68
    • C12N15/113C12N15/111C12N2310/14C12N2310/323C12N2310/3511C12N2320/51
    • The invention relates to iRNA agents, which preferably include a monomer in which the ribose moiety has been replaced by a moiety other than ribose that further includes a tether having one or more linking groups, in which at least one of the linking groups is a cleavable linking group. The tether in turn can be connected to a selected moiety, e.g., a ligand, e.g., a targeting or delivery moiety, or a moiety which alters a physical property. The cleavable linking group is one which is sufficiently stable outside the cell such that it allows targeting of a therapeutically beneficial amount of an iRNA agent (e.g., a single stranded or double stranded iRNA agent), coupled by way of the cleavable linking group to a targeting agent—to targets cells, but which upon entry into a target cell is cleaved to release the iRNA agent from the targeting agent. The inclusion of such a monomer can allow for modulation of a property of the iRNA agent into which it is incorporated, e.g., by using the non-ribose moiety as a point to which a ligand or other entity, e.g., a lipophilic moiety. e.g., cholesterol, is is directly, or indirectly, tethered. The invention also relates to methods of making and using such modified iRNA agents.
    • 本发明涉及iRNA试剂,其优选包括其中核糖部分已被核糖替代的单体,其进一步包括具有一个或多个连接基团的系链,其中至少一个连接基团是可切割的 连接组。 系链又可以连接到所选择的部分,例如配体,例如靶向或递送部分,或改变物理性质的部分。 可切割连接基团是在细胞外部足够稳定的连接基团,使得其允许靶向治疗有益量的iRNA试剂(例如,单链或双链iRNA试剂),其通过可切割连接基团连接至 靶向细胞靶向细胞,但是在进入靶细胞时被切割以从靶向剂释放iRNA试剂。 包含这样的单体可以允许调节掺入其中的iRNA试剂的性质,例如通过使用非核糖部分作为配体或其它实体例如亲油部分的点。 例如胆固醇,是直接的或间接地束缚的。 本发明还涉及制备和使用这种修饰的iRNA试剂的方法。