An 18-mL vial was charged with 4-chloro-2-(5-chloro-2-thienyl)-6,7-dihydro-5H-cyclopenta[d]pyrimidine (30 mg, 0.11 mmol, 1.1 eq.), 2-(4-aminophenyl)acetic acid (15 mg, 0.1 mmol, 1 eq.), and AcOH (1 ml). To the mixture was added HCl (4 N in dioxane, 5 drops) The resulting mixture was stirred at 100° C. for 2 hr. After cooling to rt, the reaction mixture was diluted with addition of water. The precipitate was collected by filtration and washed with water followed by dichloromethane, The product thus obtained (30 mg, 78% yield) was further treated with ethyl acetate to afford 2-[4-[[2-(5-chloro-2-thienyl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl]amino]phenyl]acetic acid (7.2 mg). MW=385.87. 1H NMR (DMSO-D6, 360 MHz) δ 9.22 (brs, 1H), 7.76 (d, J=3.9 Hz, 1H), 7.70 (d, J=8.2 Hz, 2H), 7.26 (d, J=8.2 Hz, 2H), 7.21 (d, J=3.9 Hz, 1H), 3.55 (s, 2H), 2.87 (m, 4H), 2.09 (m, 2H).
