Disclosed are compounds of Formula 1, and pharmaceutically acceptable salts thereof, wherein G, p, R1, R2, R3a, R4, and R5 are defined in the specification. This disclosure also relates to materials and methods for preparing compounds of Formula 1, to pharmaceutical compositions which contain them, and to their use for treating disorders, diseases, and conditions involving the immune system and inflammation, including rheumatoid arthritis, cancer, and other disorders, diseases, and conditions for which inhibition of SYK is indicated.