Compounds that modulate the conversion of AMP to adenosine by 5′-nucleotidase, ecto, and compositions containing the compounds and methods for synthesizing the compounds, are described herein. The use of such compounds and compositions for the treatment and/or prevention of a diverse array of diseases, disorders and conditions, including cancer- and immune-related disorders, that are mediated by 5′-nucleotidase, ecto is also provided.

The disclosure is directed to compounds of Formula I ##STR00001## Pharmaceutical compositions comprising compounds of Formula I, as well as methods of their use and preparation, are also described.

The present invention is directed to 4′-substituted nucleoside derivatives of Formula I ##STR00001##
and their use in the inhibition of HIV reverse transcriptase, the prophylaxis of infection by HIV, the treatment of infection by HIV, and the prophylaxis, treatment, and delay in the onset or progression of AIDS and/or ARC.

The present invention is directed to 4′-substituted nucleoside derivatives of Formula I ##STR00001##
and their use in the inhibition of HIV reverse transcriptase, the prophylaxis of infection by HIV, the treatment of infection by HIV, and the prophylaxis, treatment, and delay in the onset or progression of AIDS and/or ARC.

The present invention provides a compound of Formula (I) or a salt thereof;

##STR00001##

and therapeutic uses of these compounds. The invention further provides pharmaceutical compositions comprising these compounds, and compositions comprising these compounds with a therapeutic co-agent, and methods of using the compounds and compositions for treatment of viral infections, especially HRV.

The present invention provides a compound of Formula (I) or a salt thereof;

##STR00001##

and therapeutic uses of these compounds. The invention further provides pharmaceutical compositions comprising these compounds, and compositions comprising these compounds with a therapeutic co-agent, and methods of using the compounds and compositions for treatment of viral infections, especially HRV.

The present invention is directed to compounds, compositions and methods for treating or preventing Flaviviridae family of viruses (including HCV, Yellow fever, Dengue, Chikungunya and West Nile virus), RSV, HEV, and influenza infection and cancer in human subjects or other animal hosts.

A class of polycyclic compounds of general formula (I), wherein Base1, Base2, Y, Ya, Xa, Xa1, Xb, Xb1, Xc, Xc1, Xd, Xd1, R.sup.1, R1a, R2a, R3, R3a, R4, R4a, R5, R6, R6a, R7, R7a, R8, R8a, and R9 are defined herein, that may be useful as inductors of type I interferon production, specifically as STING active agents, are provided. Also provided are processes for the synthesis and use of compounds. (I)

##STR00001##

A class of polycyclic compounds of general formula (I), wherein Base1, Base2, Y, Ya, Xa, Xa1, Xb, Xb1, Xc, Xc1, Xd, Xd1, R.sup.1, R1a, R2a, R3, R3a, R4, R4a, R5, R6, R6a, R7, R7a, R8, R8a, and R9 are defined herein, that may be useful as inductors of type I interferon production, specifically as STING active agents, are provided. Also provided are processes for the synthesis and use of compounds. (I)

##STR00001##

There is provided a novel phosphate ester compound having a pyrrolopyrimidine skeleton having an excellent antitumor effect or a pharmaceutically acceptable salt thereof, and a method for preventing and/or treating a tumor in combination with an alkylating agent and/or a radiation therapy. According to one aspect of the present invention, there is provided a compound represented by the following general formula (1) or a pharmaceutically acceptable salt thereof, and a method for preventing and/or treating a tumor in combination with an alkylating agent and/or a radiation therapy.

##STR00001##