Abstract: The invention provides a compound of formula (I) wherein B is a nucleobase; U is O or S; Rx is —OC(?O)Ry, —OC(?O)CH(Ry)NH2, —OCH2OC(?O)Ry; Ry is optionally substituted alkyl or alkenyl or the side chain of a natural or unnatural amino acid R1 is H, or optionally substituted phenyl, benzyl, naphthyl, pyridyl or indolyl, or Rx and R1 together define a bond thus forming a cyclic phosphate; R2 and R2? together define the side chain of a natural or unnatural amino acid; R3 is optionally substituted alkyl, cycloalkyl, phenyl or benzyl; and pharmaceutically acceptable salts and compositions thereof which are useful in the treatment of cancer, especially leukemias.

Abstract: Compounds of the formula I wherein X is a bond or —CH2, and pharmaceutically acceptable salts thereof are useful in the parenteral treatment of leukemia, myelodysplastic syndrome or lymphoma, especially in patients presenting with cytarabine resistance and/or over 60 years of age.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6alkyl; R6 is C1-C6alkyl or C3-C7cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6alkyl; R6 is C1-C6or C3-C7cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6alkyl; R6 is C1-C6alkyl or C3-C7cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: Compounds of the formula I wherein X is a bond or —CH2, and pharmaceutically acceptable salts thereof are useful in the parenteral treatment of leukemia, myelodysplastic syndrome or lymphoma, especially in patients presenting with cytarabine resistance and/or over 60 years of age.

Abstract: Combination therapy with sorafenib or regorafenib and a phosphoramidate prodrug of troxacitabine with the formula: where Y is C1-C8 straight or branched chain alkyl, X is H, halo, C3-C4cycloalkyl or C1-C4alkyl and Z is H or fluoro, or a pharmaceutically acceptable salt thereof, shows surprising utility in the treatment of liver cancer or liver metastasis.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6alkyl; R6 is C1-C6alkyl or C3-C7cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: The invention provides a compound of formula (I) wherein B is a nucleobase; U is O or S; Rx is —OC(?O)Ry, —OC(?O)CH(Ry)NH2, —OCH2OC(?O)Ry; Ry is optionally substituted alkyl or alkenyl or the side chain of a natural or unnatural amino acid R1 is H, or optionally substituted phenyl, benzyl, naphthyl, pyridyl or indolyl, or Rx and R1 together define a bond thus forming a cyclic phosphate; R2 and R2? together define the side chain of a natural or unnatural amino acid; R3 is optionally substituted alkyl, cycloalkyl, phenyl or benzyl; and pharmaceutically acceptable salts and compositions thereof which are useful in the treatment of cancer, especially leukemias.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6alkyl; R6 is C1-C6alkyl or C3-C7cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6alkyl; R6 is C1-C6alkyl or C3-C7cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6alkyl; R6 is C1-C6alkyl or C3-C7cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: Combination therapy with sorafenib or regorafenib and a phosphoramidate prodrug of troxacitabine with the formula: where Y is C1-C8 straight or branched chain alkyl, X is H, halo, C3-C4cycloalkyl or C1-C4alkyl and Z is H or fluoro, or a pharmaceutically acceptable salt thereof, shows surprising utility in the treatment of liver cancer or liver metastasis.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6alkyl; R6 is C1-C6alkyl or C3-C7cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: Combination therapy with sorafenib or regorafenib and a phosphoramidate prodrug of troxacitabine with the formula: where Y is C1-C8 straight or branched chain alkyl, X is H, halo, C3-C4cycloalkyl or C1-C4alkyl and Z is H or fluoro, or a pharmaceutically acceptable salt thereof, shows surprising utility in the treatment of liver cancer or liver metastasis.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5 is H or C1-C6alkyl; R6 is C1-C6alkyl or C3-C7cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, C1-C6alkyl, OH, C(?O)R6, O(C?O)R6 or O(OQ)OR6; R5? is H or C1-C6alkyl; R6 is C1-C6alkyl or C3-C7cloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: Combination therapy with sorafenib or regorafenib and a phosphoramidate prodrug of troxacitabine with the formula: where Y is C1-C8 straight or branched chain alkyl, X is H, halo, C3-C4cycloalkyl or C1-C4alkyl and Z is H or fluoro, or a pharmaceutically acceptable salt thereof, shows surprising utility in the treatment of liver cancer or liver metastasis.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, OH, C1-C6 alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6 alkyl; R6 is C1-C6 alkyl or C3-C7 cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.

Abstract: The invention provides compounds of the formula: R1 is OR11, or NR5R5?; R2 is H or F; R5 is H, OH, C1-C6 alkyl, OH, C(?O)R6, O(C?O)R6 or O(C?O)OR6; R5? is H or C1-C6 alkyl; R6 is C1-C6 alkyl or C3-C7 cycloalkyl; R13 is H, phenyl, pyridyl, benzyl, indolyl or naphthyl wherein the phenyl, pyridyl, benzyl, indolyl and naphthyl is optionally substituted with 1, 2 or 3 R22; and the other variables are as defined in the claims, which are of use in the treatment of cancer, and related aspects.