Potassium Carbonate → Tert-butyl 4-[[2-methyl-4-(3-methylphenyl)phenyl]methyl]piperazine-1-carboxylate

HRID 2278262Notes

Reaction equation

HRID 2278262 reaction equation
Br[C:2]1[CH:7]=[CH:6][C:5]([CH2:8][N:9]2[CH2:14][CH2:13][N:12]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:11][CH2:10]2)=[C:4]([CH3:22])[CH:3]=1.[CH3:23][C:24]1[CH:25]=[C:26](B(O)O)[CH:27]=[CH:28][CH:29]=1.C(=O)([O-])[O-].[K+].[K+].O1CCOCC1>O.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>[CH3:22][C:4]1[CH:3]=[C:2]([C:28]2[CH:27]=[CH:26][CH:25]=[C:24]([CH3:23])[CH:29]=2)[CH:7]=[CH:6][C:5]=1[CH2:8][N:9]1[CH2:14][CH2:13][N:12]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:11][CH2:10]1

Participants

7

Reactant 4

HCID 11430Potassium CarbonateHCID 312751,4-DioxaneHCID 27339503-Tolylboronic acidHCID 89676989Tert-butyl 4-[(4-bromo-2-methylphenyl)methyl]piperazine-1-carboxylate

Product 1

HCID 89677194Tert-butyl 4-[[2-methyl-4-(3-methylphenyl)phenyl]methyl]piperazine-1-carboxylateYield 102.3%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent2×

Conditions

Temperature
80 °C

Procedure

A 100 mL round-bottom flask was charged tert-butyl 4-[(4-bromo-2-methylphenyl)methyl]piperazine-1-carboxylate (1.90 g, 5.14 mmol, 1.00 equiv), (3-methylphenyl)boronic acid (2.12 g, 15.6 mmol, 3.00 equiv), potassium carbonate (2.15 g, 15.6 mmol, 3.00 equiv), Pd(PPh3)4 (0.600 g, 0.520 mmol, 0.10 equiv), dioxane (25 mL), water (2.5 mL) with an inert atmosphere of nitrogen. The resulting solution was stirred overnight at 80° C., diluted with water (50 mL), extracted with dichloromethane (3×40 mL) and the organic layers were combined, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (20/80) to provide in 2.00 g (95% yield) of tert-butyl 4-[[2-methyl-4-(3-methylphenyl)phenyl]methyl]piperazine-1-carboxylate as light yellow oil. LCMS (ESI, m/z): 381 [M+H]+.

Workup

  1. extractionextracted with dichloromethane (3×40 mL)
  2. dry with materialdried over Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated under reduced pressure
  5. customThe residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (20/80)

Sources & evidence

ORD record
ord-3c9f9f0faeb946ba93bdfe139adbbf58
Source dataset
uspto-grants-2015_09
Patent number
US09133148B2

Reaction notes

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