Aminothiazole compounds as protein kinase inhibitors

A compound of formula (I) below or a pharmaceutically acceptable salt thereof:

• wherein
• R1 is C1-6 alkyl or C1-6 thioalkyl;
• X is O or NRa, in which Ra is H or C1-6 alkyl;
• Y is CRbRc or NRd, in which each of Rb and Rc, independently, is H, halo, C1-6 alkyl, C1-6 alkoxyl, or amino, or Rb, together with Ra, the carbon atom bonded to Rb, and the nitrogen atom bonded to Ra, is C3-10 heterocycloalkyl;
• and Rd is H or C1-6 alkyl, or Rd, together with Ra and the nitrogen atoms bonded to Rd and Ra, is C3-10 heterocycloalkyl;
• R2 is —CH2CH2Re or NRfRg, in which Re is H, halo, C1-6 alkyl, or ORh and each of Rf and Rg, independently, is C1-6 alkyl or C3-8 cycloalkyl, Rh being H or C1-6 alkyl, or Rh, together with Rd, the oxygen atom bonded to Rh, and the nitrogen atom bonded to Rd, being C3-10 heterocycloalkyl;
• and
• R3 is 6-membered heteroaryl.