Toluene → N-(4-(3-fluoro-7-methoxyquinolin-4-yloxy)phenyl)-4-(4-(trifluoromethyl)phenyl) phthalazin-1-amine

Participants

Reaction Conditions

Reaction Steps

Racemic-2-(di-t-butylphosphino)-1,1′-binaphthyl (84 mg, 210 μmol), 4-chloro-3-fluoro-7-methoxyquinoline (67 mg, 315 μmol), 4-(4-(4-(trifluoromethyl)phenyl)phthalazin-1-ylamino)phenol (80 mg, 210 μmol), cesium carbonate (137 mg, 420 μmol), and Pd2 dba3 (96 mg, 105 μmol) were combined in a resealable tube, and the tube was purged with nitrogen. Toluene (1049 μl, 210 μmol) was added and the tube was sealed and heated to 100° C. overnight. Analysis by LCMS showed incomplete conversion to product. The reaction mixture was diluted with water and DCM, and the water layer was separated and extracted first with DCM followed by ethyl acetate. The combined organic extracts were dried over MgSO4, filtered, and concentrated in vacuo. The dark residue was taken up in DCM and hexanes, and a precipitate formed. The solid was filtered and purified by preparative HPLC. The crude reaction mixture was taken up in minimal DMSO and methanol and purified on the Gilson {15-85% (0.1% TFA in CH3CN) in H2O over 20 min}. Clean product containing fractions were combined and neutralized with saturated aqueous NaHCO3 then extracted with ethyl acetate, dried over MgSO4, filtered and concentrated in vacuo to afford N-(4-(3-fluoro-7-methoxyquinolin-4-yloxy)phenyl)-4-(4-(trifluoromethyl)phenyl) phthalazin-1-amine as a tan solid. Further purification was accomplished by silica gel chromatography (90:10 CH2Cl2:MeOH). N-(4-(3-fluoro-7-methoxyquinolin-4-yloxy)phenyl)-4-(4-(trifluoromethyl)phenyl) phthalazin-1-amine was afforded as a tan solid. MS [M+H]=557.0. Calc'd for C19H21N5O: 556.15.

Provenance & Evidence