To a 40-mL vial with magnetic stirbar at 25° C. under a nitrogen atmosphere was added 4-{(S)-2-[Ethyl-(4-nitro-benzenesulfonyl)-amino]-1-phenyl-ethylamino}-quinazoline-8-carboxylic acid amide (0.45 g, 0.86 mmol, 1 eq.) and anhydrous acetonitrile (25 mL). The Cesium carbonate (0.84 g, 2.6 mmol, 3 eq.) was added followed by the thiophenol (0.14 g, 1.3 mmol, 0.13 mL, 1.5 eq.). Stirring was continued at 25° C.×16 hours. The reaction mixture was diluted with saturated aqueous NH4Cl solution (40 mL) and extracted with EtOAc (30 mL)×3. The combined organics were washed with brine (20 mL), dried (e.g., Na2SO4), filtered and concentrated. The resulting residue was purified by column chromatography (ISCO CombiFlash) using a 0-100% gradient (10% MeOH in EtOAc/EtOAc) to afford 58.3 mg (21% yield). LCMS (ESI) 336.2 (M+H).
