Heteroaromatic compounds as btk inhibitors

A compound of the formula (I)

• wherein
• A ring is:
• R1 is N(R3)2 or hydrogen;
• Cy is aryl or heteroaryl each is substituted by R2 and optionally substituted by halogen, halo C1 alkyl, C1-4 alkyl and C1-4 alkoxy;
• R2 is chosen from:
• L-Ar, C1-6 alkyl and C1-6 alkoxy, each Ar, C1-6 alkyl and C1-6 alkoxy are optionally substituted by halogen, halo C1-4 alkyl, C1 alkyl, R3—S(O)m—, —CN, —C(O)—N(R3)2 or C1-4 alkoxy;
• L is a linker chosen from a bond, O, >C(O), —(CH2)n—, —O—(CH2)n—, —N(R3)—, —N(R3)—(CH2)n—, —(CH2)n—N(R3)—, —C(O)—N(R3)—, —C(O)—N(R3)—(CH2)n—, —N(R3)—C(O)—N(R3)—, —N(R3)—C(O)—, —S(O)m—N(R3)— and —N(R3)—S(O)m—, wherein the —CH2— in each L can have 1-2 hydrogens replaced by C1-3 alkyl, said C1-3 alkyl groups can optionally cyclize to form a C3-6 cycloalkyl ring;
• Ar is carbocycle, heterocycyl or heteroaryl;
• X1 is a linker chosen from a bond, —(CH2)n—;
• Y is chosen from C7-C10 spirocycle optionally containing 0-1 ring nitrogen atoms, a nitrogen containing mono- or bi-cyclic heterocycle, carbocycle, aryl, each substituted by one R4;
• R4 is
• wherein R5 cannot be hydrogen,
• each n is independently 1-4;
• each m is independently 0-2;
• each R3 is independently chosen from hydrogen or C1-4 alkyl;
• each R5 is independently chosen from hydrogen, C1-4 alkyl, C1-4 alkoxy, C1-4 alkylC1-4 alkoxy, —(CH2)n-heterocycle and heterocycle each heterocycle optionally substituted by halogen, OH or R3—S(O)m—;
• each group defined above for Cy, R1-R5, X1 and Y can be where possible partially or fully halogenated;
• or a pharmaceutically acceptable salt thereof.