[NH2:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[C:4](Cl)[N:3]=1.[C:10]([C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1)#[CH:11].C(N(CC)CC)C.C1COCC1>O.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.[Cu]I.C(#N)C>[Cl:8][C:6]1[CH:5]=[C:4]([C:11]#[C:10][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[N:3]=[C:2]([NH2:1])[CH:7]=1Dichlorobis(triphenylphosphine)palladium(II) (2.5 g, 3.06 mmol) is added to a mixture of 2-amino-4,6-dichloropyridine (5 g, 30.7 mmol), ethynylbenzene (7.05 g, 69 mmol), copper(I) iodide (0.58 g, 3.07 mmol), triethylamine (10.8 ml, 78 mmol), THF (25 ml) and ACN (50 ml) under argon atmosphere and is stirred at 90° C. for 17 h. The mixture is diluted with water (100 ml) and extracted with EtOAc. The combined organic layers are dried over MgSO4 and concentrated in vacuo. The product is purified by NP chromatography. Yield: 3.52 g (50%). HPLC-MS: M+H=229; tR=1.85 min (METHOD—1).
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