Novel 4-amino-2-phenylpyrimidine derivatives were synthesized and evaluated as GPR119 agonists. Optimization of the substituents on the phenyl ring at the 2-position and the amino group at the 4-position led to the identification of 3, 4-dihalogenated and 2, 4, 5- trihalogenated phenyl derivatives showing potent GPR119 agonistic activity. The advanced analog (2R)-3-{[2-(4-chloro-2, 5-difluorophenyl)-6-ethylpyrimidin-4-yl] amino} propane-1, ...