Cl[C:2]1[C:3]2[CH:10]=[C:9]([C:11]([O:13][CH3:14])=[O:12])[S:8][C:4]=2[N:5]=[CH:6][N:7]=1.[F:15][C:16]1[CH:22]=[CH:21][C:19]([NH2:20])=[C:18]([O:23][CH:24]2[CH2:29][CH2:28][O:27][CH2:26][CH2:25]2)[CH:17]=1.C1(C)C=CC(S(O)(=O)=O)=CC=1>O1CCOCC1>[F:15][C:16]1[CH:22]=[CH:21][C:19]([NH:20][C:2]2[C:3]3[CH:10]=[C:9]([C:11]([O:13][CH3:14])=[O:12])[S:8][C:4]=3[N:5]=[CH:6][N:7]=2)=[C:18]([O:23][CH:24]2[CH2:29][CH2:28][O:27][CH2:26][CH2:25]2)[CH:17]=1Methyl 4-chlorothieno[2,3-d]pyrimidine-6-carboxylate (0.256 g, 1.12 mmol), 4-fluoro-2-(tetrahydro-2H-pyran-4-yloxy)aniline (0.236 g, 1.12 mmol) and para-toluene sulfonic acid (0.021 g, 0.01 mmol) were heated at reflux in anhydrous 1,4-dioxane (6 mL) for 4 hours. The solution was cooled, concentrated in vacuo and the crude product absorbed on to silica. The sample was purified by flash column chromatography (100% DCM→10% MeOH/DCM) to yield the title compound (0.220 g, 49%) after recrystallisation from MeOH.
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