Cesium carbonate → Methyl 2-methyl-4-(4-methylpiperazin-1-yl)benzoate
Reaction equation
Br[C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([CH3:12])[CH:3]=1.C([O-])([O-])=O.[Cs+].[Cs+].[CH3:19][N:20]1[CH2:25][CH2:24][NH:23][CH2:22][CH2:21]1>C([O-])(=O)C.[Pd+2].C([O-])(=O)C.CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2.O1CCOCC1>[CH3:12][C:4]1[CH:3]=[C:2]([N:23]2[CH2:24][CH2:25][N:20]([CH3:19])[CH2:21][CH2:22]2)[CH:11]=[CH:10][C:5]=1[C:6]([O:8][CH3:9])=[O:7]Participants
7
Reactant 3
Product 1
Reagents, catalysts & solvents 3
Conditions
- Temperature
- 100 °C
Procedure
In a pressure vessel was added methyl 4-bromo-2-methylbenzoate (500 mg, 2.18 mmol), Dioxane (5.0 mL), Cs2CO3 (1.4 g, 4.36 mmol), and Xantphos (92.0 mg, 0.16 mmol). The mixture was stirred and nitrogen was bubbled into the reaction for 5 min before adding in Palladium(II) acetate (58 mg, 0.08 mmol), and commercially available N-methyl piperazine (0.26 mL, 2.62 mmol). The vessel was then sealed and heated to 100° C. overnight. The reaction was cooled and filtered through celite. The supernatant was then concentrated and column purified (5:95 EtOAc:Hexanes) to give methyl 2-methyl-4-(4-methylpiperazin-1-yl)benzoate (480 mg, 89% yield).
Workup
- customnitrogen was bubbled into the reaction for 5 min
- customThe vessel was then sealed
- temperatureThe reaction was cooled
- filtrationfiltered through celite
- concentrationThe supernatant was then concentrated
- customcolumn purified (5:95 EtOAc:Hexanes)
Sources & evidence
- ORD record
- ord-627032fea15145fcb80507eed3c08447
- Source dataset
- uspto-grants-2012_08
- Patent number
- US08242129B2
Reaction notes
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