Lomond Therapeutics Inc. has prepared and tested compounds having N-arylpyrimidin-2-amine derivatives and acting as protein kinase inhibitors, particularly mitogen-activated protein kinase kinase kinase kinase 1 (MAP4K1; HPK1; MEKKK1). As such, they are reported to be useful for the treatment of autoimmune diseases, sepsis, neurodegeneration, male infertility, vascular and inflammatory disorders, cancer and viral infections.