Pyrimidine derivative compound, pharmaceutically acceptable salt thereof, preparation process thereof, and pharmaceutical composition using the same

A pyrimidine derivative compound represented by Formula VIII:

• wherein
• F is —X—(CH2)n-(O—CH2)m- and forms a 3- to 6-membered heterocyclic ring together with adjacent N and C atoms wherein X is
• or —CH2—, and wherein (i) when n is 0, m is 0 or 1, (ii) when n is 1, m is 0 or 1, and (iii) when n is 2, m is 0;
• R3 is hydrogen, a —C1 to C3 alkyl group, an allyl group, -Tf, a C1 to C3 alkyl benzyl group, or
• and
• R6 is
• wherein R and R′ are each independently a benzyl group or a C1 to C3 alkyl group.