Novel phosphonic acid based prodrugs of PMEA and its analogues

The compounds of Formula II:

• 25
• wherein:
• MPO3H2 is a phosphonic acid selected from the group consisting of 9-(2-phosphonylmethoxyethyl)adenine, (R)-9-(2-phosphonylmethoxypropyl)adenine, 9-(2-phosphonylmethoxyethyl)guanine, 9-(2-phosphonylmethoxyethyloxy)adenine, 9-(2-phosphonylmethoxyethyl)-2,6-diaminopurine, (S)-1-(3-hydroxy-2-phosphonylmethoxypropyl)cytosine, (S)-9-(3-hydroxy-2-phosphonylmethoxypropyl)adenine, 9-(3-hydroxy-2-phosphonylmethoxypropyl)guanine, and (S)-9-(3-fluoro-2-phosphonylmethoxypropyl)adenine;
• V is selected from a group consisting of phenyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-furanyl, 3-furanyl, 2-thienyl, and 3-thienyl, all optionally substituted with 1-3 substituents selected from a group consisting of F, Cl, Br, C1-C3 alkyl, CF3 and OR6;
• R6 is selected from group consisting of C1-C3 alkyl, and CF3;
• and pharmaceutically acceptable salts thereof.

The compounds of Formula III:

• 26
• wherein:
• MPO3H2 is a phosphonic acid selected from the group consisting of 9-(2-phosphonylmethoxyethyl)adenine, (R)-9-(2-phosphonylmethoxypropyl)adenine, 9-(2-phosphonylmethoxyethyl)guanine, 9-(2-phosphonylmethoxyethyloxy)adenine, 9-(2-phosphonylmethoxyethyl)-2,6-diaminopurine, (S)-1-(3-hydroxy-2-phosphonylmethoxypropyl)cytosine, (S)-9-(3-hydroxy-2-phosphonylmethoxypropyl)adenine, 9-(3-hydroxy-2-phosphonylmethoxypropyl)guanine, and (S)-9-(3-fluoro-2-phosphonylmethoxypropyl)adenine;
• V is selected from a group consisting of phenyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-furanyl, 3-furanyl, 2-thienyl, and 3-thienyl, all optionally substituted with 1-3 substituents selected from a group consisting of F, Cl, Br, C1-C3 alkyl, CF3 and OR6;
• R6 is selected from the group consisting of C1-C3 alkyl, and CF3;
• and pharmaceutically acceptable salts thereof.

A method of treating diseases of the liver in an animal by administering a compound of Formula I:

• 28
• wherein:
• M and V are cis to one another and MPO3H2 is a phosphonic acid selected from the group consisting of 9-(2-phosphonylmethoxyethyl)adenine, (R)-9-(2-phosphonylmethoxy propyl)adenine, 9-(2-phosphonylmethoxyethyl)guanine, 9-(2-phosphonylmethoxyethyloxy) adenine, 9-(2-phosphonylmethoxyethyl)-2,6-diaminopurine, (S)-1-(3-hydroxy-2-phosphonylmethoxypropyl)cytosine, (S)-9-(3-hydroxy-2-phosphonyl methoxypropyl)adenine, 9-(3-hydroxy-2-phosphonylmethoxypropyl)guanine, and (S)-9-(3-fluoro-2-phosphonyl methoxypropyl)adenine;
• V is selected from a group consisting of phenyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-furanyl, 3-furanyl, 2-thienyl, and 3-thienyl, all optionally substituted with 1-3 substituents selected from a group consisting of F, Cl, Br, C1-C3 alkyl, CF3 and OR6;
• R6 is selected from the group consisting of C1-C3 alkyl, and CF3;
• and pharmaceutically acceptable salts thereof.

A method of increasing the therapeutic index of a drug by administering compounds of Formula I:

• 30
• wherein:
• M and V are cis to one another and MPO3H2 is a phosphonic acid selected from the group consisting of 9-(2-phosphonylmethoxyethyl)adenine, (R)-9-(2-phosphonylmethoxypropyl) adenine, 9-(2-phosphonylmethoxyethyl)guanine, 9-(2-phosphonylmethoxyethyloxy)adenine, 9-(2-phosphonylmethoxyethyl)-2,6-diaminopurine, (S)-1-(3-hydroxy-2-phosphonylmethoxypropyl)cytosine, (S)-9-(3-hydroxy-2-phosphonylmethoxypropyl)adenine, 9-(3-hydroxy-2-phosphonylmethoxypropyl)guanine, and (S)-9-(3-fluoro-2-phosphonylmethoxypropyl)adenine;
• V is selected from a group consisting of phenyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-furanyl, 3-furanyl, 2-thienyl, and 3-thienyl, all optionally substituted with 1-3 substituents selected from a group consisting of F, Cl, Br, C1-C3 alkyl, CF3 and OR6;
• R6 is selected from the group consisting of C1-C3 alkyl, and CF3;
• and pharmaceutically acceptable salts thereof.

A pharmaceutical composition comprising a pharmaceutically effective amount of a compound of Formula I:

• 35
• wherein:
• M and V are cis to one another and MPO3H2 is a phosphonic acid selected from the group consisting of 9-(2-phosphonylmethoxyethyl)adenine, (R)-9-(2-are phosphonylmethoxypropyl) adenine, 9-(2-phosphonylmethoxyethyl)guanine, 9-(2-phosphonylmethoxyethyloxy)adenine, 9-(2-phosphonylmethoxyethyl)-2,6-diaminopurine, (S)-1-(3-hydroxy-2-phosphonylmethoxypropyl)cytosine, (S)-9-(3-hydroxy-2-phosphonylmethoxypropyl)adenine, 9-(3-hydroxy-2-phosphonylmethoxypropyl)guanine, and (S)-9-(3-fluoro-2-phosphonylmethoxypropyl)adenine;
• V is selected from a group consisting of phenyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-furanyl, 3-furanyl, 2-thienyl, and 3-thienyl, all optionally substituted with 1-3 substituents selected from a group consisting of F, Cl, Br, C1-C3 alkyl, CF3 and OR6;
• R6 is selected from the group consisting of C1-C3 alkyl, and CF3;
• and pharmaceutically acceptable salts thereof, and a pharmaceutically effective amount of an antiviral agent, or salts thereof, and pharmaceutically acceptable excipients.

A pharmaceutical composition comprising a pharmaceutically effective amount of a compound of Formula I:

• 36
• wherein:
• M and V are cis to one another and MPO3H2 is a phosphonic acid selected from the group consisting of 9-(2-phosphonylmethoxyethyl)adenine, (R)-9-(2-phosphonylmethoxy propyl)adenine, 9-(2-phosphonylmethoxyethyl)guanine, 9-(2-phosphonylmethoxy ethyloxy)adenine, 9-(2-phosphonylmethoxyethyl)-2,6-diaminopurine, (S)-1-(3-hydroxy-2-phosphonylmethoxypropyl)cytosine, (S)-9-(3-hydroxy-2-phosphonylmethoxypropyl)adenine, 9-(3-hydroxy-2-phosphonylmethoxypropyl)guanine, and (S)-9-(3-fluoro-2-phosphonyl methoxypropyl)adenine;
• V is selected from a group consisting of phenyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-furanyl, 3-furanyl, 2-thienyl, and 3-thienyl, all optionally substituted with 1-3 substituents selected from a group consisting of F, Cl, Br, C1-C3 alkyl, CF3 and OR6;
• R6 is selected from the group consisting of C1-C3 alkyl, and CF3;
• and pharmaceutically acceptable salts thereof, and a pharmaceutically effective amount of an oncolytic agent, or salts thereof, and pharmaceutically acceptable excipients.