Abstract: Substituted 1,3-oxathiolanes, such as cis- and trans-2-ethoxycarbonyl-5-hydroxy-1,3-oxathiolane and cis- and trans-2-ethoxycarbonyl-5-acetoxy-1,3-oxathiolane, are suitable as intermediates for the production of substituted 1,3-oxathiolanes nucleoside analogs having antiviral properties.

Abstract: The present invention provides a novel method for treating leukemia and more particularly acute myelogenous leukemia (AML) in a host comprising administering to the host a therapeutically effective amount of a compound having the formula I: 1

Abstract: The present invention relates to a method for the treatment or prevention of Flavivirus infections using nucleoside analogues in a host comprising administering a therapeutically effective amount of a compound having the formula I or a pharmaceutically acceptable salt thereof.

Abstract: The present invention provides a novel method for treating leukemia and more particularly acute myelogenous leukemia (AML) in a host comprising administering to the host a therapeutically effective amount of a compound having the formula I: wherein B is cytosine or 5-fluorocytosine and R is selected from the group comprising H, monophosphate, diphosphate, triphosphate, carbonyl substituted with a C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C6-10 aryl, and wherein each Rc is independently selected from the group comprising H, C1-6 alkyl, C2-6 alkynyl, C2-6 alkynyl and an hydroxy protecting group; and wherein said compound is substantially in the form of the (−) enantiomer.

Abstract: The invention is a process for stereoselectively producing a dioxolane nucleoside analogue from an anomeric mixture of &bgr; and &agr; anomers represented by the following formula A or formula B: wherein R is selected from the group consisting of C1-6 alkyl and C6-15 aryl and Bz is benzoyl. The process comprises hydrolyzing said mixture with an enzyme selected from the group consisting of Protease N, Alcalase, Savinase, ChiroCLEC-BL, PS-30, and ChiroCLEC-PC to stereoselectively hydrolyze predominantly one anomer to form a product wherein R1 is replaced with H. The process also includes the step of separating the product from unhydrolyzed starting material. Additionally, the functional group at the C4 position is stereoselectively replaced with a purinyl or pyrimidinyl or derivative thereof.

Abstract: In accordance with the present invention there is provided a nucleoside analogue of formula (I) or (Ia) which is useful as an antiviral agent.

Abstract: The present invention relates to uses and methods for treating or preventing a viral infection selected from the group consisting of herpes simple virus, varicella zoster virus, respiratory syncytial virus and cytomegalovirus in a host comprising using a therapeutically effective amount of a compound having the formula I or a pharmaceutically acceptable salt thereof. The present invention also includes pharmaceutical compositions and combinations.

Abstract: In accordance with the present invention there is provided a method for treating or preventing a Flaviviridea viral infection in a host comprising administering a therapeutically effective amount of at least one compound of formula (I) or (II) 1

Abstract: The present invention provides a novel method for treating leukemia and more particularly acute myelogenous leukemia (AML) in a host comprising administering to the host a therapeutically effective amount of a compound having the formula I: wherein B is cytosine or 5-fluorocytosine and R is selected from the group comprising H, monophosphate, diphosphate, triphosphate, carbonyl substituted with a C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C6-10 aryl, and wherein each Rc is independently selected from the group comprising H, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl and an hydroxy protecting group; and wherein said compound is substantially in the form of the (−) enantiomer.

Abstract: The present invention is directed towards novel compounds that are effective inhibitors of integrins, particularly &agr;IIb&bgr;3 or &agr;v integrins such as &agr;v&bgr;3 and &agr;v&bgr;5. One embodiment of the present invention comprises a compound of formula (I) or formula (II) or a pharmaceutically acceptable salt, solvate, or metabolic precursor thereof. R1, R2, R3, and R4 are defined herein.

Abstract: The invention is a process for stereoselectively producing a dioxolane nucleoside analogue from an anomeric mixture of &bgr; and &agr; anomers represented by the following formula A or formula B: 1

Abstract: The present invention is concerned with novel [1,8] naphthyridine derivatives useful for the inhibition of the hepatitis virus, more specifically the hepatitis C virus.

Abstract: Compounds of formula I: wherein Y, X, R1 and Ra are defined herein are in methods for treating or preventing a viral infections selected from herpes simplex virus, varicella zoster virus, respiratory syncytial virus and cytomegalovirus infections.

Abstract: In accordance with the present invention there is provided a method for treating or preventing a Flaviviridea viral infection in a host comprising administering a therapeutically effective amount of at least one compound of formula (I) or (II) or a pharmaceutically acceptable salts thereof, wherein Ra, R, Z and Y are defined in the application.

Abstract: Disclosed are compounds of the formula

Abstract: The invention relates to cis-nucleosides of formula (I): and pharmaceutically acceptable salts thereof, wherein X, R3, R4 and are as defined herein. The nucleosides can be in racemic form or in the form of their (+) or (−) enantiomers. The compounds are useful for treating HBV and/or HIV infections, alone or in combination with other therapeutic agents.

Abstract: The invention is a process for stereoselectively producing a dioxolane nucleoside analogue from an anomeric mixture of &bgr; and &agr; anomers represented by the following formula A or formula B: wherein R is selected from the group consisting of C1-6 alkyl and C6-15 aryl and Bz is benzoyl. The process comprises hydrolyzing said mixture with an enzyme selected from the group consisting of Protease N, Alcalase, Savinase, ChiroCLEC-BL, PS-30, and ChiroCLEC-PC to stereoselectively hydrolyze predominantly one anomer to form a product wherein R1 is replaced with H. The process also includes the step of separating the product from unhydrolyzed starting material. Additionally, the functional group at the C4 position is stereoselectively replaced with a purinyl or pyrimidinyl or derivative thereof.

Abstract: The present invention relates to methods and compositions for preparing biologically important nucleoside analogues containing 1,3-dioxolane sugar rings. In particular, this invention relates to the stereoselective synthesis of the beta (cis) isomer by glycosylating the base with an intermediate of formula (II) below a temperature of about −10° C.

Abstract: The present invention relates to heterocyclic Compounds having antiviral activity. In particular, Compounds of formula (I): wherein B, W, X, Y, Q, R1, R2, R3, R4 and n are as defined herein, are useful in the therapy and prophylaxis of viral infection in mammals.

Abstract: In accordance with the present invention there is provided a pharmaceutical combination useful for the treatment of viral infections comprising a at least one antiviral active compound of formula (1): and at least one further therapeutic agent chosen from nucleoside analogues; NNRTIs; and protease inhibitors.