[O:1]=[C:2]1[CH2:7][CH2:6][CH2:5][NH:4][CH2:3]1.[CH:8]([O:10][CH2:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1)=[O:9].Br[C:19]1[CH:24]=[CH:23][C:22]([Br:25])=[CH:21][N:20]=1.C(=O)([O-])[O-].[Cs+].[Cs+].BrC1C=CC(N2CCOCC2=O)=NC=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:25][C:22]1[CH:23]=[CH:24][C:19]([CH:7]2[CH2:6][CH2:5][N:4]([C:8]([O:10][CH2:11][C:12]3[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=3)=[O:9])[CH2:3][C:2]2=[O:1])=[N:20][CH:21]=13-oxopiperidin-1-benzyl formate (860 mg, 2.67 mmol), 2,5-dibromopyridine (949 mg, 4.01 mmol), cesium carbonate (1.74 g, 5.34 mmol), Pd2(dba)3 (127 mg, 0.13 mmol) and xantphos (92.3 mg, 0.16 mmol) reacted following the synthetic method of compound 19a to afford 1 g of white solid, yield 97%.
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