Abstract: The present invention relates to compounds of formula I that function as inhibitors of RET (rearranged during transfection) kinase enzyme activity: wherein HET, X1, X2, X3, X4, integer a and R3 are each as defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of proliferative disorders, such as cancer, as well as other diseases or conditions in which RET kinase activity is implicated.

Abstract: The present invention relates to compounds of Formula I that function as inhibitors of RET (rearranged during transfection) kinase enzyme activity: wherein HET, bonds a, b, c and d, X1, X2, X3, X4, R2, and R3 are each as defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of proliferative disorders, such as cancer, as well as other diseases or conditions in which RET kinase activity is implicated.

Abstract: The present invention relates to compounds of formula I that function as inhibitors of RET (rearranged during transfection) kinase enzyme activity: wherein HET, X1, X2, X3, X4, integer a and R3 are each as defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of proliferative disorders, such as cancer, as well as other diseases or conditions in which RET kinase activity is implicated.

Abstract: The present invention relates to compounds of Formula I that function as inhibitors of RET (rearranged during transfection) kinase enzyme activity: wherein HET, bonds a, b, c and d, X1, X2, X3, X4, R2, and R3 are each as defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of proliferative disorders, such as cancer, as well as other diseases or conditions in which RET kinase activity is implicated.

Abstract: The present invention relates to compounds of Formula I that function as inhibitors of RET (rearranged during transfection) kinase enzyme activity: wherein HET, bonds a, b, c and d, X1, X2, X3, X4, R2, and R3 are each as defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of proliferative disorders, such as cancer, as well as other diseases or conditions in which RET kinase activity is implicated.

Abstract: The present invention relates to compounds of Formula I that function as inhibitors of RET (rearranged during transfection) kinase enzyme activity: wherein HET, bonds a, b, c and d, X1, X2, X3, X4, R2, and R3 are each as defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of proliferative disorders, such as cancer, as well as other diseases or conditions in which RET kinase activity is implicated.

Abstract: The present invention relates to compounds of formula I that function as inhibitors of RET (rearranged during transfection) kinase enzyme activity: wherein HET, X1, X2, X3, X4, integer a and R3 are each as defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of proliferative disorders, such as cancer, as well as other diseases or conditions in which RET kinase activity is implicated.

Abstract: The present invention relates to compounds of formula I that function as inhibitors of RET (rearranged during transfection) kinase enzyme activity: wherein HET, X1, X2, X3, X4, integer a and R3 are each as defined herein. The present invention also relates to processes for the preparation of these compounds, to pharmaceutical compositions comprising them, and to their use in the treatment of proliferative disorders, such as cancer, as well as other diseases or conditions in which RET kinase activity is implicated.

Abstract: Compounds of formula (I); wherein R1 is H or NHZ; R2 is optionally substituted aryl or heteroaryl attached via a carbon atom; R3 is H; optionally substituted C1-C6alkyl, C2-C6alkenyl, C2-C6alkynyl, or C3 C7 cycloalkyl, halogen; OH or OR, or R4 is H, optionally substituted C1-C6alkyl, C3 C6alkenyl, C3-C6alkynyl, C3-C7 cycloalkyl, aryl or heteroaryl, R5 is H or optionally substituted C1-C6alkyl, C3-C6alkenyl, C3-C6alkynyl, or C3-C7 cycloalkyl; or R4 and R5 together form a 5 or 6-membered heterocyclic ring; and R10 is optionally substituted C1-C6alkyl; are purine receptor, particularly adenosine receptor antagonists, useful for treatment of, inter alia, movement disorders such as Parkinsons disease.