3,4-Dimethylaniline → Methyl 4-[(3,4-dimethylphenyl)amino]-2-methyl-1-oxo-1,2-dihydro-3-isoquinolinecarboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of methyl 2-methyl-1-oxo-4-{[(trifluoromethyl)sulfonyl]oxy}-1,2-dihydro-3-isoquinolinecarboxylate (0.84 g, 2.3 mmol) and (3,4-dimethylphenyl)amine (0.362 g, 2.99 mmol) in 1,4-dioxane (25 mL) under nitrogen was added cesium carbonate (1.124 g, 3.45 mmol), dimethylbisdiphenylphosphinoxanthene (0.103 g, 0.172 mmol) and Pd(OAc)2 (0.026 g, 0.115 mmol) and the mixture was stirred at 100° C. for 16 hours. The mixture was diluted with diethyl ether, filtered through Celite and the filter cake was washed with diethyl ether. The crude product was purified on silica using EtOAc/hexanes 10-30% to provide the title compound as a yellow solid (0.59 g, 74%). 1H NMR (400 MHz, CDCl3) δ ppm 8.48 (dd, J=1.2, 5.9 Hz, 1 H), 7.69-7.52 (m, 3 H), 6.89 (d, J=8.2 Hz, 1 H), 6.55-6.29 (m, 2 H), 5.66 (s, 1 H), 3.86 (s, 3 H), 3.62-3.51 (m, 3 H), 3.57 (s, 4 H), 2.14 (s, 9 H), 2.24-2.07 (m, 6 H), 1.56 (s, 3 H);); ES-LCMS: 337.3 (M+1).

Provenance & Evidence