Pyridin-4-yl or pyrimidin-4-yl substituted pyrazines

A compound of the formula

• wherein
• R1 is hydrogen, X—Ra, optionally substituted C1-4 alkyl, halogen, hydroxyl, optionally substituted C1-4 alkoxy, optionally substituted C1-4 alkylthio, optionally substituted C1-4 alkylsulfinyl, CH2OR12, amino, mono and di- C1-6 alkyl substituted amino, N(R10)C(O)Rb, N(R10)S(O)2Rd, or an N-heterocyclyl ring which ring has from 5 to 7 members and optionally contains an additional heteroatom selected from oxygen, sulfur or NR15;
• Y is CH;
• X is oxygen, sulfur or NH;
• Ra is C1-6 alkyl, aryl, arylC1-6 alkyl, heterocyclic, heterocyclylC1-6 alkyl, heteroaryl, or heteroarylC1-6 alkyl moiety, wherein each of these moieties may be optionally substituted;
• Rb is hydrogen, C1-6 alkyl, C3-7 cycloalkyl, aryl, arylC1-4 alkyl, heteroaryl, heteroarylC1-4 alkyl, heterocyclyl, or heterocyclylC1-4 alkyl;
• Rd is C1-6 alkyl, C3-7 cycloalkyl, aryl, arylC1-4 alkyl, heteroaryl, heteroarylC1-4 alkyl, heterocyclyl, or heterocyclylC1-4 alkyl;
• n is 0, or an integer having a value of 1 to 10;
• v is 0, or an integer having a value of 1 or 2;
• m is 0, or the integer having a value of 1 or 2;
• m′ is an integer having a value of 1 or 2;
• m″ is 0, or an integer having a value of 1 to 5;
• R2 and R3 are independently hydrogen, (CR10R23)nOR9, (CR10R23)nOR11, C1-10 alkyl, halo-substituted C1-10 alkyl, C2-10 alkenyl, C2-10 alkynyl, C3-7 cycloalkyl, C3-7cycloalkylC1-10 alkyl, C5-7 cycloalkenyl, C5-7 cycloalkenyl C1-10 alkyl, aryl, arylC1-10 alkyl, heteroaryl, heteroarylC1-10 alkyl, heterocyclyl, heterocyclylC1-10 alkyl, (CR10R23)nS(O)mR18, (CR10R23)nNHS(O)2R18, (CR10R23)nNR13R14, (CR10R23)nNO2, (CR10R23)nCN, (CR10R23)nS(O)m′NR13R14, (CR10R23)nC(Z)R11, (CR10R23)nOC(Z)R11, (CR10R23)nC(Z)OR11, (CR10R23)nC(Z)NR13R14, (CR10R23)nC(Z)NR11OR9, (CR10R23)nNR10C(Z)R11, (CR10R23)nNR10C(Z)NR13R14, (CR10R23)nN(OR6)C(Z)NR13R14, (CR10R23)nN(OR6)C(Z)R11, (CR10R23)nC(═NOR6)R11, (CR10R23)nNR10C(═NR19)NR13R14, (CR10R23)nOC(Z)NR13R14, (CR10R23)nNR10C(Z) NR13R14, (CR10R23)nNR10C(Z)OR10, 5-(R18)-1,2,4-oxadizaol-3-yl or 4-(R12)-5-(R18R19)-4,5-dihydro-1,2,4-oxadiazol-3-yl;
• wherein the cycloalkyl, cycloalkyl alkyl, aryl, arylalkyl, heteroaryl, heteroaryl alkyl, heterocyclic and heterocyclic alkyl moieties may be optionally substituted;
• R4 is phenyl, naphth-1-yl or naphth-2-yl ring, or a heteroaryl ring, which ring is optionally substituted independently by one to three substituents, and which, for a 4-phenyl, 4-naphth-1-yl, 5-naphth-2-yl or 6-naphth-2-yl substituent, is halogen, cyano, nitro, C(Z,NR7R17, C(Z)OR16, (CR10R20)vCOR12, SR5, S(O)R5, OR12, halo-substituted-C1-4 alkyl, C1-4alkyl, ZC(Z)R12, NR10C(Z)R16, or (CR10R20)vNR10R20 and which, for other positions of substitution, is halogen, cyano, nitro, phenyl, C(Z)NR13R14, C(Z)OR3, (CR10R20)m″COR25, S(O)mR25, OR25, halosubstituted-C1-4 alkyl, C1-10 alkyl, ZC(Z)R25, optionally substituted phenyl, (CR10R20)m″NR10C(Z)R25, NR10S(O)m′R8, NR10S(O)m′NR7R17, or (CR10R20)m″NR13R14;
• R5 is hydrogen, C1-4 alkyl, C2-4 alkenyl, C2-4 alkynyl or NR7R17, excluding the moieties SR5 being SNR7R17 and SOR5 being SOH;
• R6 is hydrogen, a pharmaceutically acceptable cation, C1-10 alkyl, C3-7 cycloalkyl, aryl, arylC1-4 alkyl, heteroaryl, heteroarylC1-4 alkyl, heterocyclic, aroyl, or C1-10 alkanoyl;
• R7 and R17 is each independently selected from hydrogen or C1-4 alkyl or R7 and R17 together with the nitrogen to which they are attached form a heterocyclic ring of 5 to 7 members which ring optionally contains an additional heteroatom selected from oxygen, sulfur or NR15;
• R8 is C1-10 alkyl, halo-substituted C1-10 alkyl, C2-10 alkenyl, C2-10 alkynyl, C3-7 cycloalkyl, C5-7 cycloalkenyl, aryl, arylC1-10 alkyl, heteroaryl, heteroarylC1-10 alkyl, (CR10R20)nOR11, (CR10R20)nS(O)mR18, (CR10R20)nNHS(O)2R18, or (CR10R20)nNR13R14;
• wherein the aryl, arylalkyl, heteroaryl, heteroaryl alkyl moieties may be optionally substituted;
• R9 is hydrogen, C(Z)R11 or optionally substituted C1-10 alkyl, S(O)2R18, optionally substituted aryl or optionally substituted arylC1-4 alkyl;
• R10 and R20 is each independently selected from hydrogen or C1-4 alkyl;
• R11 is hydrogen, C1-10 alkyl, C3-7 cycloalkyl, heterocyclyl, heterocyclyl C1-10 alkyl, aryl, arylC1-10 alkyl, heteroaryl or a heteroarylC1-10 alkyl moiety, wherein the aryl, arylalkyl, heteroaryl, heteroaryl alkyl, heterocyclyl or heterocyclylalkyl moieties may be optionally substituted;
• R12 is hydrogen or R16;
• R13 and R14 is each independently selected from hydrogen or optionally substituted C1-4 alkyl, optionally substituted aryl or optionally substituted aryl-C1-4alkyl, or together with the nitrogen which they are attached form a heterocyclic ring of 5 to 7 members which ring optionally contains an additional heteroatom selected from oxygen, sulfur or NR9;
• R15 is hydrogen, C1-4 alkyl or C(Z)—C1-4 alkyl;
• R16 is C1-4 alkyl, halo-substituted-C1-4 alkyl, or C3-7 cycloalkyl;
• R18 is C1-10 alkyl, C3-7 cycloalkyl, heterocyclyl, aryl, arylC1-10 alkyl, heterocyclyl, heterocyclyl-C1-10 alkyl, heteroaryl or a heteroarylalkyl moiety, wherein the aryl, arylalkyl, heteroaryl, heteroaryl alkyl, heterocyclyl or heterocyclylalkyl moieties may be optionally substituted;
• R19 is hydrogen, cyano, C1-4 alkyl, C3-7 cycloalkyl or aryl;
• R23 is hydrogen, C1-6 alkyl, C3-7 cycloalkyl, aryl, arylC1-4 alkyl, heteroaryl, heteroarylC1-4 alkyl, heterocyclyl, or heterocyclylC1-4 alkyl moiety, all of which moieties may be optionally substituted;
• R25 is heterocyclyl, heterocyclylC1-10 alkyl or R8;
• and
• Z is oxygen or sulfur;
• or a pharmaceutically acceptable salt thereof.