[NH:1]1[CH2:6][CH2:5][O:4][CH2:3][C:2]1=[O:7].Br[C:9]1[CH:14]=[CH:13][C:12]([Br:15])=[CH:11][N:10]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>C1(C)C=CC=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2>[Br:15][C:12]1[CH:13]=[CH:14][C:9]([N:1]2[CH2:6][CH2:5][O:4][CH2:3][C:2]2=[O:7])=[N:10][CH:11]=1Morpholin-3-one (500 mg, 4.94 mmol) and 2,5-dibromopyridine (1.76 g, 7.42 mmol) were dissolved in toluene, to which was added cesium carbonate (2.42 g, 7.42 mmol). The resulting mixture was flushed with argon for 3 times. Then Pd2(dba)3 (226 mg, 0.247 mmol) and xantphos (171 mg, 0.296 mmol) were added, followed by flushing again with argon. The reaction mixture was heated to 100° C. and allowed to react overnight. After the reaction completed, the mixture was filtered. Column chromatography afforded 815 mg of white solid (compound 19a), yield 64%.
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