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

HRID 572515Notes

Reaction equation

[CH3:1][N:2]1[C:11]([C:12]([O:14][CH3:15])=[O:13])=[C:10](OS(C(F)(F)F)(=O)=O)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[C:3]1=[O:24].[CH3:25][C:26]1[CH:27]=[C:28]([NH2:33])[CH:29]=[CH:30][C:31]=1[CH3:32].C(=O)([O-])[O-].[Cs+].[Cs+].CC1C2OC3C(=CC=CC=3)CC=2C(P(C2C=CC=CC=2)C2C=CC=CC=2)=C(P(C2C=CC=CC=2)C2C=CC=CC=2)C=1C>O1CCOCC1.C(OCC)C.CC([O-])=O.CC([O-])=O.[Pd+2]>[CH3:25][C:26]1[CH:27]=[C:28]([NH:33][C:10]2[C:9]3[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=3)[C:3](=[O:24])[N:2]([CH3:1])[C:11]=2[C:12]([O:14][CH3:15])=[O:13])[CH:29]=[CH:30][C:31]=1[CH3:32]

Participants

Conditions

Temperature: 100 °C

Procedure

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).

Workup

filtrationfiltered through Celite
washthe filter cake was washed with diethyl ether
customThe crude product was purified on silica

Sources & evidence

ORD record: ord-605ae13b083044e0b0ec092ea85d7b58
Source dataset: uspto-grants-2015_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09029391B2

Reaction notes

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