Br[C:2]1[CH:3]=[N:4][C:5]2[C:10]([CH:11]=1)=[CH:9][CH:8]=[C:7]([F:12])[CH:6]=2.[C:13]([O-])([O-])=O.[K+].[K+].CB1OB(C)OB(C)O1>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O1CCOCC1>[F:12][C:7]1[CH:6]=[C:5]2[C:10]([CH:11]=[C:2]([CH3:13])[CH:3]=[N:4]2)=[CH:9][CH:8]=13-bromo-7-fluoro-quinoline (Intermediate 30) (100 mg, 0.442 mmol) was combined with K2CO3 (153 mg, 1.10 mmol), anhydrous 1,4-dioxane (3 mL), and trimethylboroxine (0.092 mL, 0.663 mmol). Nitrogen was bubbled in to degas the reaction and Pd(PPh3)4 (50.9 mg, 0.044 mmol) was added. This was degassed again and then heated to 90° C. for 5 h. The reaction was cooled and partitioned between ethyl acetate and sat. aq. NaHCO3. The separated aqueous layer was extracted with ethyl acetate and the combined organics dried over MgSO4. Purification by silica gel flash chromatography (ethyl acetate/heptane) gave 7-fluoro-3-methyl-quinoline (52.7 mg) as a yellow solid. 1H NMR (400 MHz, CDCl3) δ 8.78 (d, J=1.8 Hz, 1H) 7.93 (s, 1H) 7.65-7.79 (m, 2H) 7.32 (td, J=8.6, 2.5 Hz, 1H) 2.52 (s, 3H); MS (M+1): 162.1.
Wird geladen…
