Kinase inhibitors

1. A compound of formula (III),

or a salt or protected derivative thereof, wherein Z 2 represents a structural fragment of formula (V),

wherein:

X represents CH or N,

Y represents NR 2 R 3 ;

R a and R b , together with the C-atoms to which they are attached, form a fused phenyl ring that is optionally substituted by one or more substituents selected from the group consisting of C 1-3 alkyl, C 1-3 haloalkyl, cyano and halo,

or one of R a and R b represents H, halo, cyano, C 1-3 alkyl or C 1-3 haloalkyl and the other independently represents halo, cyano, C 1-3 alkyl or C 1-3 haloalkyl

or R a and R b together represent C 3-5 n-alkylene, which alkylene group is optionally substituted by one or more methyl substituents and/or which alkylene group optionally contains one C—C double bond between two C-atoms of the n-alkylene chain;

R 1 is selected from the group consisting of hydrogen, OH, halogen, CN, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 0-3 alkylene-C 3-6 cycloalkyl, C 0-3 alkylene-O—C 1-3 alkylene-C 3-6 cycloalkyl, C 1-6 alkoxy, C 1-6 haloalkoxy, C 1-6 hydroxyalkyl, C 0-3 alkylene-SO 2 C 1-3 alkyl, C 0-3 alkylene-SO 2 NR 4 R 5 , and C 0-3 alkylene-NR 6 R 7 and C 0-3 alkylene-NCOR 6 R 7 ;

one of R 2 and R 3 represents —[C 2-4 alkylene-O] 1-12 —[C 2-4 alkylene]-R 2a and the other of R 2 and R 3 is selected from the group consisting of H, C 1-8 alkyl, C 0-6 alkylene aryl, C 0-6 alkylene heteroaryl, —[C 2-4 alkylene-O] 0-12 —[C 2-4 alkylene]-R 2a , C 0-6 alkylene-4-10 membered heterocycle, and C 0-3 alkylene-O—C 0-6 alkylene-4-10 membered heterocycle with the proviso that when the said heterocycle is linked through nitrogen there are at least two C-atoms in the alkylene chain that links that nitrogen atom to the essential O atom of the substituent, wherein independently each alkyl or alkylene group optionally bears 1 oxo substituent, and optionally one or two carbon atoms in the alkyl or alkylene chain may each be replaced by a heteroatom selected from the group consisting of O, N and S(O) p , such that when said alkyl or alkylene comprises an amine said amino group is a tertiary amine,

wherein each 4-10 membered heterocycle is optionally substituted by 1 or 2 groups independently selected from the group consisting of halo, OH, C 1-6 alkyl, C 1-4 haloalkyl, C 0-3 alkylene-O—C 0-6 alkyl, C 0-3 alkylene-O—C 1-3 haloalkyl, C 0-6 alkylene aryl, C 0-3 alkylene-O—C 0-3 alkylene aryl, C 0-6 alkylene heteroaryl, C 0-3 alkylene-O—C 0-3 alkylene heteroaryl, C(O)C 1-6 alkyl, SO 2 NR 8 R 9 , and C 0-3 alkylene-NR 8 R 9 , C 0-3 alkylene-NR 8 SO 2 R 9 and C 0-3 alkylene-NR 8 C(O)R 9 ;

R 2a represents OR 2b or N(R 2c )R 2d ;

R 2b to R 2d independently represent H or C 1-4 alkyl optionally substituted by one or more halo atoms, or R 2c and R 2d together represent

C 3-6 n-alkylene,

C 4-5 n-alkylene interrupted between C2 and C3 by —O— or —N(R 2e )— or

C 6 n-alkylene interrupted between C2 and C3, or between C3 and C4, by —O— or —N(R 2e )—,

any of which n-alkylene groups are optionally substituted by one or more substituents selected from the group consisting of halo, hydroxy, oxo, C 1-4 alkyl and C 1-4 alkoxy;

R 2e represents H or C 1-6 alkyl optionally substituted by one or more substituents selected from the group consisting of halo and hydroxy;

R 4 is H or C 1-4 alkyl;

R 5 is H or C 1-4 alkyl,

R 6 is H or C 1-4 alkyl, C(O)C 1-3 alkyl and SO 2 C 1-3 alkyl;

R 7 is H or C 1-4 alkyl, C(O)C 1-3 alkyl and SO 2 C 1-3 alkyl;

R 8 is H or C 1-4 alkyl,

R 9 is H or C 1-4 alkyl and

p is 0, 1 or 2,

wherein said protected derivative is a compound in which a H-atom of the NH 2 group of the compound of formula (III) is replaced by:

R′—C(O)—, wherein R′ is H, C 1-8 alkyl, phenyl or benzyl, which latter two groups are optionally substituted by one or more groups selected from the group consisting of halo, hydroxy, methyl and methoxy; or

R″—O—C(O)—, wherein R″ is tert-butyl, phenyl, benzyl or fluorenyl, which latter three groups are optionally substituted by one or more groups selected from the group consisting of halo, hydroxy, methyl and methoxy.

2. A compound according to claim 1 , wherein:

R a and R b , together with the C-atoms to which they are attached, form a fused phenyl ring that is unsubstituted;

X represents CH or N;

R 1 represents ethynyl or OCH 3 ;

Y represents NR 2 R 3 ;

R 2 represents —(CH 2 CH 2 O) 2-4 CH 3 ; and

R 3 is H,

wherein the protected derivative is a compound in which a H-atom of the NH 2 group of formula (III) is replaced by:

R′—C(O)—, wherein R′ is H, C 1-8 alkyl, phenyl or benzyl, which latter two groups are optionally substituted by one or more groups selected from the group consisting of halo, hydroxy, methyl and methoxy, or

R″—O—C(O)—, wherein R″ is tert-butyl, phenyl, benzyl or fluorenyl, which latter three groups are optionally substituted by one or more groups selected from the group consisting of halo, hydroxy, methyl and methoxy.

3. A compound according to claim 1 which has the following structure:

(3-((4-((4-aminonaphthalen-1-yl)oxy)pyrimidin-2-yl)amino)-5-ethynyl-N-(2-(2-(2-methoxyethoxy)ethoxy)ethyl)benzamide),

or a salt thereof.

4. A compound according to claim 1 which has the following structure:

(tert-butyl (4-((2-((3-ethynyl-5-((2-(2-(2-methoxyethoxy)ethoxy)ethyl)carbamoyl)phenyl)-amino)pyrimidin-4-yl)oxy)naphthalen-1-yl)carbamate),

or a salt thereof.