To a solution of 2-(2,5-dichloro-phenoxy)-benzoic acid (50.0 mg, 0.177 mmol, 1.0 equiv) in anhydrous DMF (1 mL) was added N-ethyldiisopropylamine (114.4 mg, 151 μL, 0.89 mmol, 5.0 equiv; [CAS RN 7087-68-5]) and HATU (80.8 mg, 0.21 mmol, 1.2 equiv; [CAS RN 148893-10-1]). After stirring of the reaction mixture at 50° C. for 1 h, 1,2,3,4-tetrahydro-quinoline (28.3 mg, 27 μL, 0.21 mmol, 1.2 equiv; [CAS RN 635-46-1]) was added and stirring at 50° C. continued over night. Removal of the solvent mixture under reduced pressure and purification by preparative HPLC on reversed phase (Xterra® PrepMSC 18, 5 μm, 19×50 mm column equipped with a Gilson Liquid Handler 215 autosampler, two Rainin Dynamax® SD-300 pumps, a Sedex ELSD 75 lightscatter and a Dionex UVD 340S UV detector) eluting with a gradient of acetonitrile/water provided 12.9 mg (18%) of the title compound. MS (ISP): 398.2 [M+H]+.
