2-(3-Azidopropyl)-5-(2,5-difluorophenyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazole (50 mg, 0.139 mmol; as prepared in example 70) was dissolved in 2.0 mL of DMF. 2-(tert-Butoxycarbonyl) propanoic acid (39 mg, 0.208 mmol), EDCI (40 mg, 0.208 mmol), HOBt (28 mg, 0.208 mmol) and TEA (0.058 mL, 0.417 mmol) were then added and the reaction allowed to stir at 23° C. Following 12 hours, the reaction was quenched by addition of saturated NaHCO3 solution, extracted (3×15 mL ethyl acetate), combined organics washed with water (1×50 mL) then dried over Na2SO4, and concentrated in vacuo. The crude reaction was purified by chromatography (20% ethyl acetate/Hex) affording the product as a white foam (70 mg, 94%). MS APCI (−) m/z 529 (M−1) detected; 1H NMR (400 MHz, CDCl3) δ 7.59 (m, 1H), 7.43 (m, 2H), 7.37 (t, 2H, J=8 Hz), 7.30 (m, 1H), 7.12 (m, 2H), 5.23 (brs, 0.5H), 5.12 (brs, 0.5H), 3.44 (m, 2H), 3.19 (m, 1H), 2.47 (m, 1H), 1.57 (d, 2H, J=9 Hz), 1.43 (m, 12H), 0.89 (m, 1H).
